Uplink resource grant release in wireless communication systems

ABSTRACT

The present disclosure provides techniques for uplink resource management. For example, a method is provided including receiving a configuration granting a plurality of periodic uplink resources for use by the first wireless communication device to transmit data on an uplink. The method further includes determining for a first uplink resource of the plurality of periodic uplink resources, that grant of the first uplink resource for use by the first wireless communication device can be released. The method further includes based on the determining for the first uplink resource, transmitting to a second wireless communication device an indication that the grant of the first uplink resource for use by the first wireless communication device can be released.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims benefit of and priority to U.S. ProvisionalPatent Application No. 62/897,713, filed Sep. 9, 2019, which is assignedto the assignee hereof and herein incorporated by reference in itsentirety as if fully set forth below and for all applicable purposes.

INTRODUCTION

Aspects of the present disclosure relate to wireless communications, andmore particularly, to techniques for managing uplink resources in awireless communication system.

Wireless communication systems are widely deployed to provide varioustelecommunication services such as telephony, video, data, messaging,broadcasts, etc. These wireless communication systems may employmultiple-access technologies capable of supporting communication withmultiple users by sharing available system resources (e.g., bandwidth,transmit power, etc.). Examples of such multiple-access systems include3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE)systems, LTE Advanced (LTE-A) systems, code division multiple access(CDMA) systems, time division multiple access (TDMA) systems, frequencydivision multiple access (FDMA) systems, orthogonal frequency divisionmultiple access (OFDMA) systems, single-carrier frequency divisionmultiple access (SC-FDMA) systems, and time division synchronous codedivision multiple access (TD-SCDMA) systems, to name a few.

In some examples, a wireless multiple-access communication system mayinclude a number of base stations (BSs), which are each capable ofsimultaneously supporting communication for multiple communicationdevices, otherwise known as user equipments (UEs). In an LTE or LTE-Anetwork, a set of one or more base stations may define an eNodeB (eNB).In other examples (e.g., in a next generation, a new radio (NR), or 5Gnetwork), a wireless multiple access communication system may include anumber of distributed units (DUs) (e.g., edge units (EUs), edge nodes(ENs), radio heads (RHs), smart radio heads (SRHs), transmissionreception points (TRPs), etc.) in communication with a number of centralunits (CUs) (e.g., central nodes (CNs), access node controllers (ANCs),etc.), where a set of one or more DUs, in communication with a CU, maydefine an access node (e.g., which may be referred to as a BS, nextgeneration NodeB (gNB or gNodeB), TRP, etc.). A BS or DU may communicatewith a set of UEs on downlink channels (e.g., for transmissions from aBS or DU to a UE) and uplink channels (e.g., for transmissions from a UEto a BS or DU).

These multiple access technologies have been adopted in varioustelecommunication standards to provide a common protocol that enablesdifferent wireless devices to communicate on a municipal, national,regional, and even global level. New radio (e.g., 5G NR) is an exampleof an emerging telecommunication standard. NR is a set of enhancementsto the LTE mobile standard promulgated by 3GPP. NR is designed to bettersupport mobile broadband Internet access by improving spectralefficiency, lowering costs, improving services, making use of newspectrum, and better integrating with other open standards using OFDMAwith a cyclic prefix (CP) on the downlink (DL) and on the uplink (UL).To these ends, NR supports beamforming, multiple-input multiple-output(MIMO) antenna technology, and carrier aggregation.

As the demand for mobile broadband access continues to increase, thereexists a need for further improvements in NR and LTE technology.Preferably, these improvements should be applicable to othermulti-access technologies and the telecommunication standards thatemploy these technologies.

SUMMARY

The systems, methods, and devices of the disclosure each have severalaspects, no single one of which is solely responsible for its desirableattributes. Without limiting the scope of this disclosure as expressedby the claims which follow, some features will now be discussed briefly.After considering this discussion, and particularly after reading thesection entitled “Detailed Description” one will understand how thefeatures of this disclosure provide advantages that include improvedcommunications between wireless communication devices.

Certain aspects provide a method for wireless communication by a firstwireless communication device. The method generally includes receiving,from a second wireless communication device, a configuration granting aplurality of periodic uplink resources for use by the first wirelesscommunication device to transmit data on an uplink. The method furtherincludes, based on determining that grant of a first uplink resource ofthe plurality of periodic uplink resources for use by the first wirelesscommunication device can be released, transmitting to the secondwireless communication device an indication that the grant of the firstuplink resource for use by the first wireless communication device canbe released.

Certain aspects provide a method for wireless communication by a firstwireless communication device. The method generally includestransmitting, to a second wireless communication device, a configurationgranting a plurality of periodic uplink resources for use by the secondwireless communication device to transmit data on an uplink to the firstwireless communication device. The method further includes receiving,from the second wireless communication device, a first indication that agrant of a first uplink resource of the plurality of uplink resourcesfor use by the second wireless communication device can be released.

Certain aspects provide a first wireless communication device. The firstwireless communication device includes a memory and a processor. Thememory and the processor are configured to receive, from a secondwireless communication device, a configuration granting a plurality ofperiodic uplink resources for use by the first wireless communicationdevice to transmit data on an uplink. The memory and the processor areconfigured to, based on determining that grant of a first uplinkresource of the plurality of periodic uplink resources for use by thefirst wireless communication device can be released, transmit to thesecond wireless communication device an indication that the grant of thefirst uplink resource for use by the first wireless communication devicecan be released.

Certain aspects provide a first wireless communication device. The firstwireless communication device includes a memory and a processor. Thememory and the processor are configured to transmit, to a secondwireless communication device, a configuration granting a plurality ofperiodic uplink resources for use by the second wireless communicationdevice to transmit data on an uplink to the first wireless communicationdevice. The memory and the processor are configured to receive, from thesecond wireless communication device, a first indication that a grant ofa first uplink resource of the plurality of uplink resources for use bythe second wireless communication device can be released.

Certain aspects provide a first wireless communication device. The firstwireless communication device generally includes means for receiving,from a second wireless communication device, a configuration granting aplurality of periodic uplink resources for use by the first wirelesscommunication device to transmit data on an uplink. The first wirelesscommunication device further includes means for, based on determiningthat grant of a first uplink resource of the plurality of periodicuplink resources for use by the first wireless communication device canbe released, transmitting to the second wireless communication device anindication that the grant of the first uplink resource for use by thefirst wireless communication device can be released.

Certain aspects provide a first wireless communication device. The firstwireless communication device generally includes means for transmitting,to a second wireless communication device, a configuration granting aplurality of periodic uplink resources for use by the second wirelesscommunication device to transmit data on an uplink to the first wirelesscommunication device. The first wireless communication device furtherincludes means for receiving, from the second wireless communicationdevice, a first indication that a grant of a first uplink resource ofthe plurality of uplink resources for use by the second wirelesscommunication device can be released.

Certain aspects provide a non-transitory computer-readable storagemedium having instructions stored thereon for performing a method forwireless communication by a first wireless communication device. Themethod generally includes receiving, from a second wirelesscommunication device, a configuration granting a plurality of periodicuplink resources for use by the first wireless communication device totransmit data on an uplink. The method further includes based ondetermining that grant of a first uplink resource of the plurality ofperiodic uplink resources for use by the first wireless communicationdevice can be released, transmitting to the second wirelesscommunication device an indication that the grant of the first uplinkresource for use by the first wireless communication device can bereleased.

Certain aspects provide a non-transitory computer-readable storagemedium having instructions stored thereon for performing a method forwireless communication by a first wireless communication device. Themethod generally includes transmitting, to a second wirelesscommunication device, a configuration granting a plurality of periodicuplink resources for use by the second wireless communication device totransmit data on an uplink to the first wireless communication device.The method further includes receiving, from the second wirelesscommunication device, a first indication that a grant of a first uplinkresource of the plurality of uplink resources for use by the secondwireless communication device can be released.

To the accomplishment of the foregoing and related ends, the one or moreaspects comprise the features hereinafter fully described andparticularly pointed out in the claims. The following description andthe appended drawings set forth in detail certain illustrative featuresof the one or more aspects. These features are indicative, however, ofbut a few of the various ways in which the principles of various aspectsmay be employed.

BRIEF DESCRIPTION OF THE DRAWINGS

So that the manner in which the above-recited features of the presentdisclosure can be understood in detail, a more particular description,briefly summarized above, may be had by reference to aspects, some ofwhich are illustrated in the drawings. It is to be noted, however, thatthe appended drawings illustrate only certain typical aspects of thisdisclosure and are therefore not to be considered limiting of its scope,for the description may admit to other equally effective aspects.

FIG. 1 is a block diagram conceptually illustrating an exampletelecommunications system, in accordance with certain aspects of thepresent disclosure.

FIG. 2 is a block diagram conceptually illustrating a design of anexample a base station (BS) and user equipment (UE), in accordance withcertain aspects of the present disclosure.

FIG. 3 is a diagram illustrating examples of radio access networks, inaccordance with various aspects of the present disclosure.

FIG. 4 is a diagram illustrating an example of an integrated access andbackhaul (IAB) network architecture in accordance with various aspectsof the disclosure.

FIG. 5 illustrates an example timeline of communication of an uplinkresource grant release message in accordance with various aspects of thedisclosure.

FIG. 6 illustrates an example timeline of communication of an uplinkresource grant release message in conjunction with scheduling request(SR) in accordance with various aspects of the disclosure.

FIG. 7A illustrates a scenario where a BS is in communication with afirst UE and a second UE in accordance with various aspects of thedisclosure.

FIG. 7B illustrates an example timeline of communication by the first UEand the second UE of FIG. 7A in accordance with various aspects of thedisclosure.

FIG. 7C illustrates a flow diagram illustrating an uplink cancellationindication (CI) procedure in accordance with various aspects of thedisclosure.

FIG. 8A illustrates a scenario where a BS is in communication with afirst UE and a second UE in accordance with various aspects of thedisclosure.

FIG. 8B illustrates an example timeline of communication by the first UEand the second UE of FIG. 8A in accordance with various aspects of thedisclosure.

FIG. 8C illustrates a flow diagram illustrating a procedure usingpre-allocated grant and activation indications in accordance withvarious aspects of the disclosure.

FIG. 9 illustrates an example timeline of communication by a UE, a firstIAB node, and a second IAB node in accordance with various aspects ofthe disclosure.

FIGS. 10A-10B show a flow diagram illustrating example operations forwireless communication by a first wireless device, in accordance withcertain aspects of the present disclosure.

FIGS. 11A-11C show a flow diagram illustrating example operations forwireless communication by a first wireless device, in accordance withcertain aspects of the present disclosure.

FIG. 12 illustrates a communications device that may include variouscomponents configured to perform operations for the techniques disclosedherein in accordance with aspects of the present disclosure.

FIG. 13 illustrates a communications device that may include variouscomponents configured to perform operations for the techniques disclosedherein in accordance with aspects of the present disclosure.

FIG. 14 shows a block diagram of a device that supports managing uplinkresources in accordance with one or more aspects of the presentdisclosure.

To facilitate understanding, identical reference numerals have beenused, where possible, to designate identical elements that are common tothe figures. It is contemplated that elements disclosed in one aspectmay be beneficially utilized on other aspects without specificrecitation.

DETAILED DESCRIPTION

Aspects of the present disclosure provide apparatus, methods, processingsystems, and computer readable mediums for supporting uplink resourcegrant release messaging in a wireless communication system.

In certain aspects, a first wireless communication device (e.g., a UE oran integrated access and backhaul (IAB)-node that depends on another(parent) IAB-node to relay communications with a base station) isconfigured to transmit uplink data on an uplink to a second wirelesscommunication device (e.g., a BS or a parent IAB-node). For example, thefirst wireless communication device is granted one or more periods(e.g., time resources, which may occur periodically) such as symbols,slots, subframes, etc., by the second wireless communication device, tocommunicate on the uplink with the second wireless communication device,and those time resources may correspond to other uplink resources, suchas frequencies or beams (e.g., spatial resources). The other uplinkresources may include one or more frequency resources, spatialresources, etc. during the one or more time resources. The firstwireless communication device can then transmit uplink data to thesecond wireless communication device on the granted one or more uplinkresources.

In certain aspects of the present disclosure, the first wirelesscommunication device does not have data to transmit during a grantedperiod, and the first wireless communication device notifies the secondwireless communication device that the first wireless communicationdevice is not going to transmit during that granted period (e.g., thefirst wireless communication device notifies to release a grant of thegiven uplink resource), so that the second wireless communication devicecan repurpose the uplink resource (e.g., the period and/or thefrequencies). For example, the second wireless communication device cangrant the uplink resource to a third wireless communication device(e.g., a UE or a child IAB-node) for the third wireless communicationdevice to use to transmit uplink data to the second wirelesscommunication device. In another example, the second wirelesscommunication device can use the uplink resource to transmit uplink datato a third wireless communication device (e.g., a parent IAB-node).

In certain aspects, the second wireless communication device grants thefirst wireless communication device uplink resources using a dynamicdownlink control information (DCI) grant. For example, the secondwireless communication device transmits a dynamic grant in DCI over aphysical downlink control channel (PDCCH) to the first wirelesscommunication device. The downlink DCI grant indicates one or moreuplink resources (e.g., individually/separately indicates each of theone or more uplink resources) that are granted to the first wirelesscommunication device for communication on the uplink with the secondwireless communication device.

In certain aspects, the second wireless communication device grants thefirst wireless communication device uplink resources using a first typeof configured grant (e.g., referred to as Type1). The configured grantmay grant periodic uplink resources (e.g., a set of frequency resourcesthat are granted in a first slot of every fifth frame of a set of 100frames). For example, the second wireless communication device transmitsa radio resource control (RRC) message to the first wirelesscommunication device. The RRC message indicates a periodicity (e.g., interms of subframe, slot, symbol or other time period) and an offset(e.g., from a starting or first indexed subframe, slot, symbol, or othertime period). Accordingly, the RRC message grants periodic uplinkresources to the first wireless communication device for communicationon the uplink with the second wireless communication device according tothe indicated periodicity and offset.

In certain aspects, the second wireless communication device grants thefirst wireless communication device uplink resources using a second typeof configured grant (e.g., referred to as Type2). For example, thesecond wireless communication device transmits both an RRC message and aDCI grant to the first wireless communication device to grant uplinkresources to the first wireless communication device for communicationon the uplink with the second wireless communication device. The RRCmessage may indicate basic configuration information for uplinkresources, such as a periodicity, configuration for a demodulationreference symbol (DMRS), etc. The DCI grant is then be used to activateor deactivate granting (e.g., by the second wireless communicationdevice) of the uplink resources that are configured by the RRC message.For example, after the RRC message is sent to the first wirelesscommunication device, a DCI grant may be sent to the first wirelesscommunication device to activate the grant of the uplink resources,meaning the first wireless communication device can use the uplinkresources to communicate. Further, at another time, a DCI grant may besent to the first wireless communication device to deactivate the grantof the uplink resources, meaning the wireless communication device canno longer use the uplink resources to communicate. In certain aspects,the DCI grant indicates time and/or frequency resource allocation forthe uplink resources, modulation and coding scheme (MCS) fortransmissions using the resources, one or more antenna ports to be usedfor transmissions using the resources, and/or a transmissionconfiguration indication (TCI) for transmissions using the resources.Accordingly, in the second type of configured grant, the uplinkresources may be considered semi-persistently scheduled (SPS) resources,as the grant can be activated or deactivated.

In certain aspects, the transmission of a dynamic DCI grant and/or DCIgrant activation or deactivation (e.g., for Type2 configured grants) tothe first wireless communication device from the second wirelesscommunication device is triggered based on a buffer status report (BSR)received by the second wireless communication device from the firstwireless communication device. For example, the first wirelesscommunication device includes an uplink buffer, which is configured tostore uplink data that the first wireless communication device has fortransmission. The first wireless communication device may transmit a BSRthat indicates a status of the uplink buffer, and accordingly indicateswhether the first wireless communication device has uplink data (e.g.,and how much data the first wireless communication device has) totransmit to the second wireless communication device. If the BSRindicates that the first wireless communication device has uplink datato transmit, the second wireless communication device may accordinglytransmit a dynamic DCI grant or a DCI grant activation granting uplinkresources to the first wireless communication device. If the BSRindicates that the first wireless communication device does not haveuplink data to transmit, the second wireless communication device mayaccordingly not transmit a dynamic DCI grant or transmit a DCI grantdeactivation.

In certain aspects, the first wireless communication device does nottransmit the BSR to the second wireless communication device unless thefirst wireless communication device has been granted one or more uplinkresources to transmit the BSR. Accordingly, the first wirelesscommunication device is configured to transmit a scheduling request (SR)to the second wireless communication device. The SR requests one or moreuplink resources from the second wireless communication device forreporting BSR from the first wireless communication device to the secondwireless communication device and/or for transmitting short (e.g., smallin size) data packets including uplink data from the first wirelesscommunication device to the second wireless communication device.

In certain aspects, the first wireless communication device isconfigured to transmit an SR to the second wireless communication deviceif one or more triggering conditions are met (e.g., as defined in 3GPPTS 38.321 incorporated herein by reference). One example triggeringcondition includes the first wireless communication device not havingany available or granted uplink resources for transmitting a regular BSRto the second wireless communication device.

Another example triggering condition includes the first wirelesscommunication device having a configured grant (e.g., a Type1 configuredgrant or an activated Type2 configured grant) of uplink resources and anSR mask that is set to false for the logical channel that triggers theregular BSR. For example, a flag set to either true or false for an SRmask for a given logical channel (e.g., an uplink channel between thefirst wireless communication device and the second wirelesscommunication device) is configured using RRC messaging (e.g.,transmitted from the second wireless communication device to the firstwireless communication device) for the first wireless communicationdevice. If the SR mask is set to false, then the first wirelesscommunication device is configured to transmit an SR even if the firstwireless communication device has a configured grant. If the SR mask isset to true, then the first wireless communication device is configuredto not transmit SR and just use the uplink resources indicated by theconfigured grant to transmit a BSR.

For configured grants (e.g., Type1 or Type2 configured grants), wherethe first wireless communication device is granted periodic uplinkresources, depending on the traffic pattern, the first wirelesscommunication device may not always have uplink data to transmit on allof the granted periodic uplink resources.

In certain aspects, the first wireless communication device can use anSR to notify the second wireless communication device whether the firstwireless communication device is going to use an upcoming granted uplinkresource. For example, if the first wireless communication device has anuplink packet in its uplink buffer, and the uplink packet is received(e.g., from an application, processor, etc. in the first wirelesscommunication device) in the uplink buffer at least a threshold timeprior to occurrence in time of a given granted uplink resource, then thefirst wireless communication device can transmit the uplink packet inthe given granted uplink resource. Accordingly, if the describedcondition regarding the uplink packet in the uplink buffer is met, thefirst wireless communication device determines to use the upcoming givengranted uplink resource and transmits the SR to the second wirelesscommunication device to notify the second wireless communication devicethat the first wireless communication device is going to use theupcoming given granted uplink resource. The SR may be configured to betransmitted on an uplink resource that occurs the threshold time priorto occurrence in time of the given granted uplink resource. If thedescribed condition is not met, the first wireless communication devicedetermines the first wireless communication device is not going to usethe upcoming given granted uplink resource and does not transmit the SRto the second wireless communication device. In response to notreceiving the SR, the second wireless communication device determinesthat the first wireless communication device is not going to use theupcoming given granted uplink resource. In certain aspects, thethreshold time prior to occurrence in time of the given granted uplinkresource is a packet preparation time (e.g., physical uplink sharedchannel (PUSCH) preparation time) required for the first wirelesscommunication device to prepare the uplink packet for transmission tothe second wireless communication device.

In certain aspects, when the first wireless communication devicenotifies the second wireless communication device that the firstwireless communication device is not going to use a granted given uplinkresource (e.g., the first wireless communication device notifies torelease a grant of the given uplink resource), the second wirelesscommunication device can repurpose the given uplink resource. Forexample, the second wireless communication device can grant the givenuplink resource to a third wireless communication device (e.g., a UE ora child IAB-node) for the third wireless communication device to use totransmit uplink data to the second wireless communication device. Inanother example, the second wireless communication device can use thegiven uplink resource to transmit uplink data to a third wirelesscommunication device (e.g., a parent IAB-node).

In certain aspects, where the first wireless communication devicefrequently releases grant of uplink resources, using SR to indicate tothe second wireless communication device only the occasional uplinkresources that the first wireless communication device does use providesefficient use of communication resources. In particular, when configuredto use SR, the first wireless communication device does not need totransmit any signaling for granted uplink resources it releases asdiscussed. Rather, SR may only be transmitted for the occasional uplinkresources that the first wireless communication device does use.

In certain aspects, however, the first wireless communication device mayfrequently use granted uplink resources and only occasionally releasegrant of uplink resources.

Accordingly, certain aspects herein provide an uplink resource grantrelease message, also referred to as a negative SR. The uplink resourcegrant release message indicates that a granted uplink resource should bereleased (e.g., will not be used). For example, the first wirelesscommunication device may transmit the uplink resource grant releasemessage for a given granted uplink resource to the second wirelesscommunication device. Based on receiving the uplink resource grantrelease message, the second wireless communication device determinesthat the given uplink resource can be repurposed (e.g., the given uplinkresource will not be used by the first wireless communication device).If the second wireless communication device does not receive an uplinkresource grant release message for a given granted uplink resource, thesecond wireless communication device determines that the first wirelesscommunication device will use the given uplink resource.

Accordingly, where the first wireless communication device frequentlyuses granted uplink resources and only occasionally releases grant ofuplink resources, using the uplink resource grant release message toindicate to the second wireless communication device only the occasionaluplink resources that the first wireless communication device releasesprovides efficient use of communication resources. In particular, incertain aspects, when configured to use uplink resource grant releasemessages, the first wireless communication device may not transmit anysignaling for granted uplink resources the first wireless communicationdevice uses as discussed. Rather, in certain aspects, an uplink resourcegrant release message may only be transmitted (e.g., by the firstwireless communication device) for the occasional uplink resources thatthe first wireless communication device releases.

The following description provides examples, and is not limiting of thescope, applicability, or examples set forth in the claims. Changes maybe made in the function and arrangement of elements discussed withoutdeparting from the scope of the disclosure. Various examples may omit,substitute, or add various procedures or components as appropriate. Forinstance, the methods described may be performed in an order differentfrom that described, and various steps may be added, omitted, orcombined. Also, features described with respect to some examples may becombined in some other examples. For example, an apparatus may beimplemented or a method may be practiced using any number of the aspectsset forth herein. In addition, the scope of the disclosure is intendedto cover such an apparatus or method which is practiced using otherstructure, functionality, or structure and functionality in addition to,or other than, the various aspects of the disclosure set forth herein.It should be understood that any aspect of the disclosure disclosedherein may be embodied by one or more elements of a claim. The word“exemplary” is used herein to mean “serving as an example, instance, orillustration.” Any aspect described herein as “exemplary” is notnecessarily to be construed as preferred or advantageous over otheraspects.

In general, any number of wireless networks may be deployed in a givengeographic area. Each wireless network may support a particular radioaccess technology (RAT) and may operate on one or more frequencies. ARAT may also be referred to as a radio technology, an air interface,etc. A frequency may also be referred to as a carrier, a subcarrier, afrequency channel, a tone, a subband, etc. Each frequency may support asingle RAT in a given geographic area in order to avoid interferencebetween wireless networks of different RATs. In some cases, a 5G NR RATnetwork may be deployed.

FIG. 1 illustrates an example wireless communication network 100 inwhich aspects of the present disclosure may be performed. For example,the wireless communication network 100 may be an NR system (e.g., a 5GNR network).

As illustrated in FIG. 1, the wireless communication network 100 mayinclude a number of base stations (BSs) 110 a-z (each also individuallyreferred to herein as BS 110 or collectively as BSs 110) and othernetwork entities. A BS 110 may provide communication coverage for aparticular geographic area, sometimes referred to as a “cell”, which maybe stationary or may move according to the location of a mobile BS 110.In some examples, the BSs 110 may be interconnected to one anotherand/or to one or more other BSs or network nodes (not shown) in wirelesscommunication network 100 through various types of backhaul interfaces(e.g., a direct physical connection, a wireless connection, a virtualnetwork, or the like) using any suitable transport network. In theexample shown in FIG. 1, the BSs 110 a, 110 b and 110 c may be macro BSsfor the macro cells 102 a, 102 b and 102 c, respectively. The BS 110 xmay be a pico BS for a pico cell 102 x. The BSs 110 y and 110 z may befemto BSs for the femto cells 102 y and 102 z, respectively. A BS maysupport one or multiple cells. The BSs 110 communicate with userequipment (UEs) 120 a-y (each also individually referred to herein as UE120 or collectively as UEs 120) in the wireless communication network100. The UEs 120 (e.g., 120 x, 120 y, etc.) may be dispersed throughoutthe wireless communication network 100, and each UE 120 may bestationary or mobile.

According to certain aspects, the BSs 110 and UEs 120 may be configuredfor using an uplink resource grant release message as discussed herein.As shown in FIG. 1, the BS 110 a includes an uplink resource manager112. The uplink resource manager 112 may be configured to transmit, to awireless communication device (e.g., UE 120 a), a configuration grantinga plurality of periodic uplink resources for use by the second wirelesscommunication device to transmit data on an uplink to the first wirelesscommunication device; receive, from the wireless communication device,an indication that a grant of a first uplink resource of the pluralityof uplink resources for use by the second wireless communication devicecan be released; and, based on receiving the indication, determine thewireless communication device has released the first uplink resource, inaccordance with aspects of the present disclosure. As shown in FIG. 1,the UE 120 a includes an uplink resource manager 122. The uplinkresource manager 122 may be configured to receive, from a wirelesscommunication device (e.g. BS 110 a), a configuration granting aplurality of periodic uplink resources for use by the first wirelesscommunication device to transmit data on an uplink; determine for afirst uplink resource of the plurality of periodic uplink resources,that grant of the first uplink resource for use by the UE can bereleased; and, based on the determining for the first uplink resource,transmit to the wireless communication device an indication that thegrant of the first uplink resource for use by the UE can be released, inaccordance with aspects of the present disclosure.

Wireless communication network 100 may also include relay stations(e.g., relay station 110 r), also referred to as relays or the like,that receive a transmission of data and/or other information from anupstream station (e.g., a BS 110 a or a UE 120 r) and sends atransmission of the data and/or other information to a downstreamstation (e.g., a UE 120 or a BS 110), or that relays transmissionsbetween UEs 120, to facilitate communication between devices.

A network controller 130 may couple to a set of BSs 110 and providecoordination and control for these BSs 110. The network controller 130may communicate with the BSs 110 via a backhaul. The BSs 110 may alsocommunicate with one another (e.g., directly or indirectly) via wirelessor wireline backhaul.

FIG. 2 illustrates example components of BS 110 and UE 120 (e.g., in thewireless communication network 100 of FIG. 1), which may be used toimplement aspects of the present disclosure. For example, antennas 252,processors 266, 258, 264, and/or controller/processor 280 of the UE 120and/or antennas 234, processors 220, 230, 238, and/orcontroller/processor 240 of the BS 110 may be used to perform thevarious techniques and methods described herein. For example, as shownin FIG. 2, the controller/processor 240 of the BS 110 has an uplinkresource manager 112 configured to transmit, to a wireless communicationdevice (e.g., UE 120), a configuration granting a plurality of periodicuplink resources for use by the second wireless communication device totransmit data on an uplink to the first wireless communication device;receive, from the wireless communication device, an indication that agrant of a first uplink resource of the plurality of uplink resourcesfor use by the second wireless communication device can be released;and, based on receiving the indication, determine the wirelesscommunication device has released the first uplink resource, inaccordance with aspects of the present disclosure. For example, as shownin FIG. 2, the controller/processor 280 of the UE 120 has an uplinkresource manager 122 configured to receive, from a wirelesscommunication device (e.g. BS 110 a), a configuration granting aplurality of periodic uplink resources for use by the first wirelesscommunication device to transmit data on an uplink; determine for afirst uplink resource of the plurality of periodic uplink resources,that grant of the first uplink resource for use by the UE can bereleased; and, based on the determining for the first uplink resource,transmit to the wireless communication device an indication that thegrant of the first uplink resource for use by the UE can be released, inaccordance with aspects of the present disclosure.

It should be noted that though FIG. 2 illustrates UE 120 communicatingwith a BS 110, a child IAB-node may similarly communicate with a parentIAB-node and each may (e.g., respectively) have similar components asdiscussed with respect to FIG. 2.

At the BS 110, a transmit processor 220 may receive data from a datasource 212 and control information from a controller/processor 240. Thecontrol information may be for the physical broadcast channel (PBCH),physical control format indicator channel (PCFICH), physical hybrid ARQindicator channel (PHICH), physical downlink control channel (PDCCH),group common PDCCH (GC PDCCH), etc. The data may be for the physicaldownlink shared channel (PDSCH), etc. The processor 220 may process(e.g., encode and symbol map) the data and control information to obtaindata symbols and control symbols, respectively. The transmit processor220 may also generate reference symbols, such as for the primarysynchronization signal (PSS), secondary synchronization signal (SSS),and cell-specific reference signal (CRS). A transmit (TX) multiple-inputmultiple-output (MIMO) processor 230 may perform spatial processing(e.g., precoding) on the data symbols, the control symbols, and/or thereference symbols, if applicable, and may provide output symbol streamsto the modulators (MODs) 232 a-232 t. Each modulator 232 may process arespective output symbol stream (e.g., for OFDM, etc.) to obtain anoutput sample stream. Each modulator may further process (e.g., convertto analog, amplify, filter, and upconvert) the output sample stream toobtain a downlink signal. Downlink signals from modulators 232 a-232 tmay be transmitted via the antennas 234 a-234 t, respectively.

At the UE 120, the antennas 252 a-252 r may receive downlink signalsfrom the BS 110 or a parent IAB-node, or a child IAB-node may receivedownlink signals from a parent IAB-node, and may provide receivedsignals to the demodulators (DEMODs) in transceivers 254 a-254 r,respectively. Each demodulator 254 may condition (e.g., filter, amplify,downconvert, and digitize) a respective received signal to obtain inputsamples. Each demodulator may further process the input samples (e.g.,for OFDM, etc.) to obtain received symbols. A MIMO detector 256 mayobtain received symbols from all the demodulators 254 a-254 r, performMIMO detection on the received symbols if applicable, and providedetected symbols. A receive processor 258 may process (e.g., demodulate,deinterleave, and decode) the detected symbols, provide decoded data forthe UE 120 to a data sink 260, and provide decoded control informationto a controller/processor 280.

On the uplink, at UE 120 or a child IAB-node, a transmit processor 264may receive and process data (e.g., for the physical uplink sharedchannel (PUSCH) or the PSSCH) from a data source 262 and controlinformation (e.g., for the physical uplink control channel (PUCCH) orthe PSCCH) from the controller/processor 280. The transmit processor 264may also generate reference symbols for a reference signal (e.g., forthe sounding reference signal (SRS)). The symbols from the transmitprocessor 264 may be precoded by a TX MIMO processor 266 if applicable,further processed by the demodulators in transceivers 254 a-254 r (e.g.,for SC-FDM, etc.), and transmitted to the base station 110 or a parentIAB-node.

At the BS 110 or a parent IAB-node, the uplink signals from the UE 120may be received by the antennas 234, processed by the modulators 232,detected by a MIMO detector 236 if applicable, and further processed bya receive processor 238 to obtain decoded data and control informationsent by the UE 120. The receive processor 238 may provide the decodeddata to a data sink 239 and the decoded control information to thecontroller/processor 240.

The controllers/processors 240 and 280 may direct the operation at theBS 110 and the UE 120, respectively. The controller/processor 240 and/orother processors and modules at the BS 110 may perform or direct theexecution of processes for the techniques described herein. Thecontroller/processor 280 and/or other processors and modules at the UE120 may perform or direct the execution of processes for the techniquesdescribed herein. The memories 242 and 282 may store data and programcodes for BS 110 and UE 120, respectively. A scheduler 244 may scheduleUEs for data transmission on the downlink and/or uplink.

FIG. 3 is a diagram illustrating examples of radio access networks, inaccordance with various aspects of the disclosure.

As shown by reference number 305, a traditional (for example, 3G, 4G,LTE) radio access network may include multiple base stations 310 (forexample, access nodes (AN)), where each base station 310 communicateswith a core network via a wired backhaul link 315, such as a fiberconnection. A base station 310 may communicate with a UE 320 via anaccess link 325, which may be a wireless link. In some aspects, a basestation 310 shown in FIG. 3 may correspond to a base station 110 shownin FIGS. 1 and 2. Similarly, a UE 320 shown in FIG. 3 may correspond toa UE 120 shown in FIGS. 1 and 2.

As shown by reference number 330, a radio access network may include awireless backhaul network. In some aspects or scenarios, a wirelessbackhaul network may sometimes be referred to as an integrated accessand backhaul (IAB) network. An IAB network may include multiple basestations and sometimes the base stations may be of differing types orhave differing operational characteristics. For example, in someaspects, an IAB network may have at least one base station that is ananchor base station 335. The anchor base station may communicates with acore network via a wired backhaul link 340, such as a fiber connection.An anchor base station 335 may also be referred to as an IAB donor.Anchor base stations can be configured to communicate with other typesof base stations or other communication devices (e.g. in a radio networkor IAB network).

The IAB network may also include one or more non-anchor base stations345. Non-anchor base stations may be referred to as relay base stationsor IAB nodes. The non-anchor base station 345 may communicate directlywith or indirectly with (for example, via one or more other non-anchorbase stations 345) the anchor base station 335 via one or more backhaullinks 350 to form a backhaul path to the core network for carryingbackhaul traffic. Backhaul link 350 may be a wireless link. Anchor basestation(s) 335 or non-anchor base station(s) 345 may communicate withone or more UEs 355 via access links 360, which may be wireless linksfor carrying access traffic. In some aspects, an anchor base station 335or a non-anchor base station 345 shown in FIG. 3 may correspond to abase station 110 shown in FIGS. 1 and 2. Similarly, a UE 355 shown inFIG. 3 may correspond to a UE 120 shown in FIGS. 1 and 2.

As shown by reference number 365, in some aspects, a radio accessnetwork that includes an IAB network may utilize a variety of spectrumtypes. For example, an IAB network may utilize a variety of differingradio frequency bands. In a few particular examples and according tosome aspects, millimeter wave technology or directional communicationscan be utilized (for example, beamforming, precoding) for communicationsbetween base stations or UEs (for example, between two base stations,between two UEs, or between a base station and a UE). In additional oralternative aspects or examples, wireless backhaul links 370 betweenbase stations may use millimeter waves to carry information or may bedirected toward a target base station using beamforming, precoding.Similarly, the wireless access links 375 between a UE and a base stationmay use millimeter waves or may be directed toward a target wirelessnode (for example, a UE or a base station). In this way, inter-linkinterference may be reduced.

In some aspects, an IAB network may support a multi-hop network or amulti-hop wireless backhaul. Additionally, or alternatively, each nodeof an IAB network may use the same radio access technology (for example,5G/NR). Additionally, or alternatively, nodes of an IAB network mayshare resources for access links and backhaul links, such as timeresources, frequency resources, and/or spatial resources. Furthermore,various architectures of IAB nodes or IAB donors may be supported.

In some aspects, an IAB donor may include a central unit (CU) thatconfigures IAB nodes that access a core network via the IAB donor andmay include a distributed unit (DU) that schedules and communicates withchild nodes of the IAB donor.

In some aspects, an IAB node may include a mobile termination component(MT) that is scheduled by and communicates with a DU of a parent node,and may include a DU that schedules and communicates with child nodes ofthe IAB node. A DU of an IAB node may perform functions described inconnection with base station 110 for that IAB node, and an MT of an IABnode may perform functions described in connection with UE 120 for thatIAB node.

FIG. 4 is a diagram illustrating an example of an IAB networkarchitecture, in accordance with various aspects of the disclosure. Asshown in FIG. 4, an IAB network may include an IAB donor 405 thatconnects to a core network via a wired connection (for example, as awireline fiber). For example, an Ng interface of an IAB donor 405 mayterminate at a core network. Additionally, or alternatively, an IABdonor 405 may connect to one or more devices of the core network thatprovide a core access and mobility management function (AMF). In someaspects, an IAB donor 405 may include a base station 110, such as ananchor base station, as described above with reference to FIG. 3. Asshown, an IAB donor 405 may include a CU, which may perform ANCfunctions or AMF functions. The CU may configure a DU of the IAB donor405 or may configure one or more IAB nodes 410 (for example, an MT or aDU of an IAB node 410) that connect to the core network via the IABdonor 405. Thus, a CU of an IAB donor 405 may control or configure theentire IAB network that connects to the core network via the IAB donor405, such as by using control messages or configuration messages (forexample, a radio resource control (RRC) configuration message or an F 1application protocol (FlAP) message).

As described above, the IAB network may include IAB nodes 410 (shown asIAB nodes 1 through 4) that connect to the core network via the IABdonor 405. As shown, an IAB node 410 may include an MT and may include aDU. The MT of an IAB node 410 (for example, a child node) may becontrolled or scheduled by another IAB node 410 (for example, a parentnode) or by an IAB donor 405. The DU of an IAB node 410 (for example, aparent node) may control or schedule other IAB nodes 410 (for example,child nodes of the parent node) or UEs 120. Thus, a DU may be referredto as a scheduling node or a scheduling component, and an MT may bereferred to as a scheduled node or a scheduled component. In someaspects, an IAB donor 405 may include a DU and not an MT. That is, anIAB donor 405 may configure, control, or schedule communications of IABnodes 410 or UEs 120. A UE 120 may include only an MT, and not a DU.That is, communications of a UE 120 may be controlled or scheduled by anIAB donor 405 or an IAB node 410 (for example, a parent node of the UE120).

According to some aspects, certain nodes may be configured toparticipate in control/scheduling processes. For example in someaspects, when a first node controls or schedules communications for asecond node (for example, when the first node provides DU functions forthe second node's MT), the first node may be referred to as a parentnode of the second node, and the second node may be referred to as achild node of the first node. A child node of the second node may bereferred to as a grandchild node of the first node. Thus, a DU of aparent node may control or schedule communications for child nodes ofthe parent node. A parent node may be an IAB donor 405 or an IAB node410, and a child node may be an IAB node 410 or a UE 120. Communicationsof an MT of a child node may be controlled or scheduled by a parent nodeof the child node.

As further shown in FIG. 4, a link between a UE 120 and an IAB donor405, or between a UE 120 and an IAB node 410, may be referred to as anaccess link 415. Each access link 415 may be a wireless access link thatprovides a UE 120 with radio access to a core network via the IAB donor405, and potentially via one or more IAB nodes 410.

As further shown in FIG. 4, a link between an IAB donor 405 and an IABnode 410, or between two IAB nodes 410, may be referred to as a backhaullink 420. Each backhaul link 420 may be a wireless backhaul link thatprovides an IAB node 410 with radio access to a core network via the IABdonor 405, and potentially via one or more other intermediate IAB nodes410. In some aspects, a backhaul link 420 may be a primary backhaul linkor a secondary backhaul link (for example, a backup backhaul link). Insome aspects, a secondary backhaul link may be used if a primarybackhaul link fails, becomes congested, or becomes overloaded. In an IABnetwork, network resources for wireless communications (for example,time resources, frequency resources, spatial resources) may be sharedbetween access links 415 and backhaul links 420.

As described above, in a typical IAB network, IAB nodes (for example,non-anchor base stations) are stationary (that is, non-moving). Nextgeneration (5G) wireless networks have stated objectives to provideultra-high data rate and support wide scope of application scenarios.Integrated access and backhaul (IAB) systems have been studied in 3GPPas one possible solution to help support these objectives.

As noted above, in IAB, a wireless backhaul solution is adopted toconnect cells (IAB-nodes) to the core network (which uses a wiredbackhaul). Some attractive characteristics of IAB are support formulti-hop wireless backhaul, sharing of the same technology (e.g., NR)and resources (e.g., frequency bands) for both access and backhaullinks.

There are various possible architectures for IAB-nodes, includinglayer-2 (L2) and layer-3 (L3) solutions and a particular architecturedeployed may depend on what layers of protocol stack are implemented inthe intermediate nodes (IAB-nodes), for example, L2 relays may implementPHY/MAC/RLC layers.

Example Uplink Resource Grant Release Message

As discussed, certain aspects herein provide an uplink resource grantrelease message, also referred to as a negative SR. For example, incertain aspects, a first wireless communication device (e.g., a UE suchas UE 120 or an IAB-node such as IAB node 410) is configured to transmitthe uplink resource grant release message to a second wirelesscommunication device (e.g., a BS such as BS 110 or an IAB-node such asIAB node 410 or IAB donor 405). In certain aspects, the uplink resourcegrant release message corresponds to an uplink resource granted to thefirst wireless communication device for transmitting uplink data to thesecond wireless communication device on an uplink. For example, theuplink resource grant release message is transmitted in a time resourceallocated for communication of an uplink resource grant release messagethat corresponds to the uplink resource. The time resource may beallocated as a certain time period (e.g., a packet preparation time)before occurrence of the uplink resource.

The uplink resource grant release message indicates to the secondwireless communication device that the first wireless communicationdevice is releasing grant of the uplink resource, meaning the firstwireless communication device will not use the uplink resource. Theuplink resource may have been granted to the first wirelesscommunication device using a configured grant as discussed. For example,the first wireless communication device may release grant of the uplinkresource because an uplink data buffer of the first wirelesscommunication device is empty as discussed. In another example, thefirst wireless communication device may release grant of the uplinkresource because an uplink packet is received by the first wirelesscommunication device (e.g., in the uplink data buffer) for processingless than a threshold time prior to occurrence of the first uplinkresource as discussed.

Further, in certain aspects, if the second wireless communication devicedoes not receive or fails to receive an uplink resource grant releasemessage in a time resource allocated for communication of an uplinkresource grant release message that corresponds to an uplink resource,the second wireless communication device determines that the firstwireless communication device is going to use the uplink resource andattempts to receive/receives uplink data from the first wirelesscommunication device on the uplink resource.

FIG. 5 illustrates an example timeline 500 of communication of an uplinkresource grant release message. As shown, timeline 500 indicates aplurality of resources 502 a-502 c allocated for communication of anuplink resource grant release message. Further, timeline 500 indicates aplurality of uplink resources 504 a-504 c granted to a first wirelesscommunication device. As shown, resource 502 a is allocated forcommunication of an uplink resource grant release message correspondingto uplink resource 504 a. Further, resource 502 b is allocated forcommunication of an uplink resource grant release message correspondingto uplink resource 504 b, and resource 502 c is allocated forcommunication of an uplink resource grant release message correspondingto uplink resource 504 c. The “arrivals” indicate arrival of uplink datain an uplink buffer with sufficient time to transmit the uplink data onthe subsequent uplink resource. As shown, the first wirelesscommunication device does not transmit an uplink resource grant releasemessage in either of resources 502 a and 502 b. Accordingly, the firstwireless communication device transmits uplink data in uplink resources504 a and 504 b. Further, as shown, the first wireless communicationdevice transmits an uplink resource grant release message in resource502 c. Accordingly, the first wireless communication device refrainsfrom transmitting uplink data in uplink resource 504 c.

In certain aspects, the uplink resource grant release message is used inconjunction with an SR to indicate usage of uplink resources. Forexample, when a first wireless communication device transmits an uplinkresource grant release message to a second wireless communication devicecorresponding to a given uplink resource, the second wirelesscommunication device determines that the first wireless communicationdevice releases the given uplink resource and any subsequent granteduplink resources until the second wireless communication device receivesa SR from the first wireless communication device. Further, when a firstwireless communication device transmits a SR to a second wirelesscommunication device corresponding to a given uplink resource, thesecond wireless communication device determines that the first wirelesscommunication device has data to transmit and uses the given uplinkresource and any subsequent granted uplink resources until the secondwireless communication device receives an uplink resource grant releasemessage from the first wireless communication device. Accordingly, theuse of uplink resource grant release message in conjunction with SR toindicate usage of uplink resources allows the first wirelesscommunication device to indicate release of multiple granted uplinkresources or use of multiple granted uplink resources for entire timeperiods, thus advantageously reducing signaling required in certaincases. In certain aspects, the resources allocated for communicatinguplink grant release message are separated in time, frequency, codingdomain (e.g., using different cyclic shifts), or any combination thereoffrom the resources allocated for communicating SR.

FIG. 6 illustrates an example timeline 600 of communication of an uplinkresource grant release message in conjunction with SR. As shown,timeline 600 indicates a plurality of resources 602 a-602 f allocatedfor communication of an uplink resource grant release message and/or SR.In certain aspects, each resource 602 may actually correspond to twoseparate resources, one for communicating uplink resource grant releasemessage, and the other for communicating SR as discussed. Further,timeline 600 indicates a plurality of uplink resources 604 a-604 fgranted to a first wireless communication device. As shown, resource 602a is allocated for communication of an uplink resource grant releasemessage/SR corresponding to uplink resource 604 a. Further, resource 602b is allocated for communication of an uplink resource grant releasemessage/SR corresponding to uplink resource 604 b, resource 602 c isallocated for communication of an uplink resource grant releasemessage/SR corresponding to uplink resource 604 c, and so on withresources 602 d-602 f corresponding to uplink resources 604 d-604 f,respectively. The “arrivals” indicate arrival of uplink data in anuplink buffer with sufficient time to transmit the uplink data on thesubsequent uplink resource.

As shown, the first wireless communication device transmits a SR inresources 602 a and 602 f, and further transmits an uplink resourcegrant release message in resource 602 d. The first wirelesscommunication device refrains from transmitting any SR and any uplinkresource grant release message in resources 602 b, 602 c, and 602 e.Accordingly, uplink resources 604 a-604 c occur after transmission of aSR and prior to transmission of an uplink resource grant releasemessage. Thus, the first wireless communication device transmits uplinkdata on uplink resources 604 a-604 c. Further, uplink resources 604d-604 e occur after transmission of an uplink resource grant releasemessage and prior to transmission of an SR. Thus, the first wirelesscommunication device refrains from transmitting uplink data on uplinkresources 604 d-604 e. Further, uplink resource 604 f occur aftertransmission of a SR and prior to transmission of an uplink resourcegrant release message. Thus, the first wireless communication devicetransmits uplink data on uplink resource 604 f.

In certain aspects, the second wireless communication device, uponreceiving an uplink resource grant release message indicating that agranted given uplink resource of a first wireless communication deviceshould be released, repurposes the given uplink resource. For example,the second wireless communication device itself may use the uplinkresource to transmit uplink data to a third wireless communicationdevice (e.g., a parent IAB-node). In another example, the secondwireless communication device may grant the uplink resource to a thirdwireless communication device (e.g., a UE or a child IAB-node). Variousspecific examples are further discussed herein.

One example is discussed with respect to FIGS. 7A-7C. FIG. 7Aillustrates a scenario 700 a where a BS 110 is in communication with afirst UE 120 a and a second UE 120 b. Further, FIG. 7B illustrates anexample timeline 700 b of communication by the first UE 120 a and thesecond UE 120 b. It should be noted that though example is discussedwith respect to a BS 110, UE 120 a, and UE 120 b, one or more of the BS110, UE 120 a, and UE 120 b may be other types of wireless communicationdevices, such as an IAB node.

As shown, timeline 700 b indicates a plurality of resources 732 b, 734b, and 736 b allocated to UE 120 a for transmitting an uplink resourcegrant release message and/or SR to BS 110. In certain aspects, eachresource 732 b, 734 b, and 736 b may actually correspond to two separateresources, one for communicating uplink resource grant release message,and the other for communicating SR as discussed. Further, timeline 700 bindicates a plurality of uplink resources 722 b, 724 b, and 726 bgranted to UE 120 a to transmit to BS 110, such as using configuredgrant. As shown, resource 732 b is allocated for communication of anuplink resource grant release message/SR corresponding to uplinkresource 722 b. Further, resource 734 b is allocated for communicationof an uplink resource grant release message/SR corresponding to uplinkresource 724 b, and resource 736 b is allocated for communication of anuplink resource grant release message/SR corresponding to uplinkresource 726 b.

As shown, in resources 732 b and 736 b, UE 120 a refrains fromtransmitting SR or transmits an uplink resource grant release message,depending on configuration of the UE 120 a as using SR and/or uplinkresource grant release message. Accordingly, UE 120 a releases granteduplink resources 722 b and 726 b. Further, in resource 734 b, UE 120 atransmits SR or refrains from transmitting an uplink resource grantrelease message, depending on configuration of the UE 120 a as using SRand/or uplink resource grant release message. Accordingly, UE 120 autilizes uplink resource 724 b and transmits uplink data to BS 110 onuplink resource 724 b.

In certain aspects, UE 120 b may indicate to the BS 110 that it hasuplink data to transmit to the BS 110, such as by transmitting an SR ora BSR requesting an uplink resource with which to transmit uplink datato the BS 110. In certain aspects, in response, the BS 110 grants anuplink resource using a dynamic DCI grant to the UE 120 b, wherein theuplink resource granted to the UE 120 b overlaps with an uplink resourcealready granted (e.g., by configured grant) to the UE 120 a. Forexample, as shown, BS 110 transmits dynamic DCI grant 702 b to UE 120 b,granting uplink resource 706 b to UE 120 b. As shown, uplink resource706 b overlaps with uplink resource 722 b. As discussed, UE 120 a hasreleased uplink resource 722 b, and therefore UE 120 b can safely useuplink resource 706 b without interfering with UE 120 a even thoughuplink resource 706 b overlaps with uplink resource 722 b.

In some cases, however, BS 110 may grant UE 120 b an uplink resourcethat overlaps with an uplink resource granted to the UE 120 a, and theUE 120 a may not release the overlapping resource. Accordingly, BS 110may transmit an uplink cancellation indication (CI) to the UE 120 breleasing the overlapping uplink resource granted to the UE 120 b. FIG.7C illustrates a flow diagram 700 c illustrating an uplink cancellationindication (CI, also referred to as a preemption or pre-emptionindication (PI)) procedure.

At step 702 c, the UE 120 b transmits to the BS 110 an SR or a BSRrequesting an uplink resource with which to transmit uplink data to theBS 110. At step 704 c, the BS 110 transmits to the UE 120 b a dynamicDCI grant 708 b granting uplink resource 712 b to the UE 120 b. Asshown, uplink resource 712 b overlaps with uplink resource 724 b grantedto UE 120 a. At step 706 c, in resource 734 b, UE 120 a transmits SR orrefrains from transmitting an uplink resource grant release message toBS 110, depending on configuration of the UE 120 a as using SR and/oruplink resource grant release message. Accordingly, BS 110 determinesthat UE 120 a intends to utilize uplink resource 724 b to transmituplink data to BS 110. As shown, the dynamic DCI grant 708 transmissionoccurs prior to the occurrence of resource 734 b, and therefore BS 110is not aware of whether UE 120 a intends to utilize uplink resource 724b prior to transmission of the dynamic DCI grant 708.

Thus, at step 708 c, BS 110 transmits an uplink CI to the UE 120 bindicating that UE 120 b should not transmit uplink data on uplinkresource 712 b or at least the portion of uplink resource 712 b thatoverlaps with uplink resource 724 b. As shown, resources fortransmitting uplink CI corresponding to an uplink resource occur priorto occurrence of the uplink resource and after occurrence of thecorresponding resource for indicating SR and/or uplink resource grantrelease message.

Based on receiving the uplink CI (at 708 c) with respect to uplinkresources 724 b and 712 b (see also FIG. 7B), at step 710 c, UE 120 bdoes not transmit uplink data to the BS 110 on any portion of uplinkresource 712 b that overlaps with uplink resource 724 b, and optionallytransmits uplink data to the BS 110 on any portion of uplink resource712 b that does not overlap with uplink resource 724 b. Further, at step710 c, UE 120 a transmits uplink data to the BS 110 on uplink resource724 b.

In certain aspects, if the UE 120 b still has uplink data to transmit tothe BS 110, at step 714 c, BS 110 transmits another dynamic DCI grant716 b (e.g., a DCI re-transmission grant, see also FIG. 7B) to the UE120 b granting uplink resource 718 b to the UE 120 b. At step 716 c, UE120 b then transmits uplink data to the BS 110 in uplink resource 718 b.

It should be noted that with respect to uplink resource 706 b (see alsoFIG. 7B) granted to UE 120 b, for which UE 120 a releases overlappinguplink resource 722 b, resource 704 b may still be allocated for BS 110to transmit an uplink CI with respect to uplink resource 706 b to UE 120b. However, based on UE 120 a releasing resource 722 b, the BS 110 doesnot transmit the uplink CI to the UE 120 b.

Another example is discussed with respect to FIGS. 8A-8C. FIG. 8Aillustrates a scenario 800 a where a BS 110 is in communication with afirst UE 120 a and a second UE 120 b. Further, FIG. 8B illustrates anexample timeline 800 b of communication by the first UE 120 a and thesecond UE 120 b. It should be noted that though example is discussedwith respect to a BS 110, UE 120 a, and UE 120 b, one or more of the BS110, UE 120 a, and UE 120 b may be other types of wireless communicationdevices, such as an IAB node.

As shown, timeline 800 b indicates a plurality of resources 832 b, 834b, and 836 b allocated to UE 120 a for transmitting an uplink resourcegrant release message and/or SR to BS 110. In certain aspects, eachresource 832 b, 834 b, and 836 b may actually correspond to two separateresources, one for communicating uplink resource grant release message,and the other for communicating SR as discussed. Further, timeline 800 bindicates a plurality of uplink resources 822 b, 824 b, and 826 bgranted to UE 120 a to transmit to BS 110, such as by using a configuredgrant. As shown, resource 832 b is allocated for communication of anuplink resource grant release message and/or SR corresponding to uplinkresource 822 b. Further, resource 834 b is allocated for communicationof an uplink resource grant release message and/or SR corresponding touplink resource 824 b, and resource 836 b is allocated for communicationof an uplink resource grant release message and/or SR corresponding touplink resource 826 b.

As shown, in resource 834 b, UE 120 a refrains from transmitting an SRor transmits an uplink resource grant release message, depending on aconfiguration of the UE 120 a as using SR and/or uplink resource grantrelease messages. Accordingly, UE 120 a releases granted uplink resource824 b. Further, in resources 832 b and 836 b, UE 120 a transmits an SRor refrains from transmitting an uplink resource grant release message,depending on the configuration of the UE 120 a as using SR and/or uplinkresource grant release messages. Accordingly, UE 120 a utilizes uplinkresources 822 b and 826 b and transmits uplink data to BS 110 on uplinkresources 822 b and 826 b.

In certain aspects, BS 110 also allocates resources (e.g., periodicresources) to UE 120 b using a message similar to a configured grant,the message being referred to herein to as a pre-allocated grant. Inparticular, the pre-allocated grant may include the same information asa configured grant (e.g., a Type1 or Type2 configured grant), but uplinkresources are only allocated by the pre-allocated grant and are notactually granted for use by the UE 120 b until activated. In particular,each uplink resource allocated to the UE 120 b is not activated oractually granted to the UE 120 b unless the UE 120 b receives anactivation indication corresponding to the uplink resource from the BS110. In certain aspects, the BS 110 transmits the activation indicationto the UE 120 b on a physical downlink control channel (PDCCH).

In certain aspects, when a UE 120 b has uplink data to transmit (e.g.,has one or more uplink data packets in an uplink data buffer) prior(e.g., a threshold time prior such as a packet preparation time) to anallocated uplink resource, the UE 120 b prepares the uplink data fortransmission in advance of receiving the activation indication. If theUE 120 b then receives the activation indication corresponding to theuplink resource, the UE 120 b can transmit the already prepared uplinkdata on the uplink resources. If the UE 120 b fails to receive theactivation indication corresponding to the uplink resource, the UE 120 brefrains from transmitting in the uplink resource.

In certain aspects, resources are allocated for communication ofactivation indications corresponding to uplink resources allocated bypre-allocated grant, and the UE 120 b monitors the resources foractivation indications. For example, as shown, timeline 800 b indicatesa plurality of resources 804 b, 810 b, and 816 b allocated to UE 120 bfor receiving from BS 110 an activation indication. Further, timeline800 b indicates a plurality of uplink resources 806 b, 812 b, and 818 ballocated to UE 120 b to transmit uplink data to BS 110, such as using apre-allocated grant. As shown, resource 804 b is allocated forcommunication of an activation indication corresponding to uplinkresource 806 b. Further, resource 810 b is allocated for communicationof an activation indication corresponding to uplink resource 812 b, andresource 816 b is allocated for communication of an activationindication corresponding to uplink resource 818 b.

FIG. 8C illustrates a flow diagram 800 c illustrating a procedure usingpre-allocated grant and activation indications. In particular, flowdiagram 800 c is described with respect to a case where UE 120 b isallocated, using a pre-allocated grant, the same or at least partiallyoverlapping periodic uplink resources as those granted to UE 120 a usinga configured grant.

At 802 c, BS 110 transmits a pre-allocated grant to UE 120 b allocatingto UE 120 b uplink resources. The uplink resources allocated may be thesame or at least partially overlap with uplink resources granted to UE120 a. For example, as shown in timeline 800 b in FIG. 8B, UE 120 b isallocated uplink resources 806 b, 812 b, and 818 b, which are the sameas uplink resources 822 b, 824 b, and 826 b granted to UE 120 a.

At 804 c, in resource 834 b (see also FIG. 8B), UE 120 a refrains fromtransmitting an SR or transmits an uplink resource grant release messageto BS 110, depending on the configuration of the UE 120 a as using SRand/or uplink resource grant release messages. Accordingly, BS 110determines that UE 120 a releases uplink resource 824 b. In response tothe release of uplink resource 824 b, which is the same or overlaps withuplink resource 812 b allocated to UE 120 b, BS 110 transmits anactivation indication to UE 120 b in resource 810 b corresponding touplink resource 812 b.

At 808 c, based on receiving the activation indication in resource 810 b(see also FIG. 8B) corresponding to uplink resource 812 b, UE 120 btransmits uplink data in uplink resource 812 b, while UE 120 a refrainsfrom transmitting in uplink resource 824 b.

The example described with respect to FIGS. 8A-8C may beneficially leadto less signaling than the example described with respect to FIGS. 7A-7Cwhen the UE 120A more often utilizes granted uplink resources than itreleases granted uplink resources.

Another example of use of an uplink resource grant release message in anIAB network is discussed with respect to FIG. 4. In certain aspects, UE120 (or similarly a child IAB node (e.g., MT of the child IAB node) ofIAB node 410 c) is granted periodic uplink resources using configuredgrant by IAB node 410 c (e.g., the DU of IAB node 410 c). For a grantedgiven uplink resource, if the UE 120 does not have uplink data totransmit on the given uplink resource, the UE 120 transmits an uplinkresource grant release message corresponding to the given uplinkresource to IAB node 410 c (e.g., the DU of IAB node 410 c). Uponreceiving the uplink resource grant release message corresponding to thegiven uplink resource, IAB node 410 c may determine to utilize the givenuplink resource to transmit uplink data. For example, IAB node 410 c(e.g., the MT of IAB node 410 c) may have uplink data in its uplink databuffer (e.g., from other UEs or child IAB nodes), and may use the givenuplink resource to transmit the uplink data to its parent IAB node, IABnode 410 a (e.g., the DU of IAB node 410 a). In certain aspects, IABnode 410 c (e.g., MT of IAB node 410 c) may prepare the uplink data inits uplink data buffer for transmission in advance of receiving theuplink resource grant release message, and once the IAB node 410 c(e.g., DU of IAB node 410 c) receives the uplink resource grant releasemessage, the IAB node 410 c (e.g., MT of IAB node 410 c) transmits theuplink data. In certain aspects, IAB node 410 c (e.g., MT of IAB node410 c) is configured to transmit SR to IAB node 410 a (e.g., DU of IABnode 410 a) prior to transmitting the uplink data to inform IAB node 410a of the transmission of the uplink data.

FIG. 9 illustrates an example timeline 900 of communication by UE 120,IAB node 410 c (DU and MT), and IAB node 410 a (DU). As shown, UE 120 isgranted (e.g., by configured grant from IAB node 410 c DU) a pluralityof uplink resources 902 a-902 d to transmit uplink data to IAB node 410c DU. Further, a plurality of resources 903 a-903 d are allocated forcommunication of uplink resource grant release messages from UE 120 toIAB node 410 c DU corresponding to uplink resources 902 a-902 d.

In addition, IAB node 410 c MT is granted (e.g., by configured grantfrom IAB node 410 a DU) a plurality of uplink resources 904 a-904 d totransmit uplink data to IAB node 410 a DU. Further, a plurality ofresources 905 a-905 d are allocated for communication of SR from IABnode 410 c MT to IAB node 410 a DU corresponding to uplink resources 904a-904 d. As shown, uplink resources 902 a-902 d are the same as oroverlap with uplink resources 904 a-904 d.

As shown, UE 120 utilizes uplink resources 902 a, 902 c, and 902 d totransmit uplink data to IAB node 410 c DU, and therefore refrains fromtransmitting uplink resource grant release messages in correspondingresources 903 a, 903 c, and 903 d. Further, UE 120 releases uplinkresource 902 b, and therefore transmits an uplink resource grant releasemessage in corresponding resource 903 b.

Based on IAB node 410 c DU failing to receive uplink resource grantrelease messages in resources 903 a, 903 c, and 903 d, IAB node 410 c DUdetermines that UE 120 is utilizing uplink resources 902 a, 902 c, and902 d to transmit uplink data to IAB node 410 c DU, and therefore IABnode 410 c MT determines to refrain from transmitting on overlappinguplink resources 904 a, 904 c, and 904 d. Accordingly, IAB node 410 c MTrefrains from transmitting SR to IAB node 410 a DU in resources 905 a,905 c, and 905 d corresponding to uplink resources 904 a, 904 c, and 904d.

Based on IAB node 410 a DU failing to receive SR in resources 905 a, 905c, and 905 d, IAB node 410 a DU determines that IAB node 410 c MT is nottransmitting uplink data in corresponding uplink resources 904 a, 904 c,and 904 d.

Further, based on IAB node 410 c DU receiving an uplink resource grantrelease message in resource 903 b, IAB node 410 c DU determines that UE120 is not utilizing uplink resource 902 b, and therefore IAB node 410 cMT determines it can use overlapping uplink resource 904 b to transmituplink data to IAB node 410 a DU. Accordingly, IAB node 410 c MTtransmits SR to IAB node 410 a DU in resource 905 b corresponding touplink resource 904 b.

Based on IAB node 410 a DU receiving SR in resource 905 b, IAB node 410a DU determines that IAB node 410 c MT is transmitting uplink data incorresponding uplink resource 904 b and receives the uplink data.

FIGS. 10A-10B show a flow diagram illustrating example operations 1000for wireless communication, in accordance with certain aspects of thepresent disclosure. The operations 1000 may be performed, for example,by a first wireless communication device (e.g., such as a UE 120 or anIAB node (e.g., MT)). Operations 1000 may be implemented as softwarecomponents that are executed and run on one or more processors (e.g.,controller/processor 280 of FIG. 2). Further, the transmission andreception of signals by the first wireless communication device inoperations 1000 may be enabled, for example, by one or more antennas(e.g., antennas 252 of FIG. 2). In certain aspects, the transmissionand/or reception of signals by the first wireless communication devicemay be implemented via a bus interface of one or more processors (e.g.,controller/processor 280) obtaining and/or outputting signals.

The operations 1000 may begin, at block 1005, by receiving, from asecond wireless communication device, a configuration (e.g., aconfigured grant) granting a plurality of periodic uplink resources foruse by the first wireless communication device to transmit data on anuplink. For example, UE 120 a (shown in FIG. 1) receives, from BS 110 a,a configuration (e.g., a configured grant) granting a plurality ofperiodic uplink resources (e.g., resources 902 a-902 d, shown in FIG. 9)for use by the UE to transmit data on an uplink.

Further, operations 1000 may optionally continue at block 1010 bydetermining, for a first uplink resource of the plurality of periodicuplink resources, that grant of the first uplink resource for use by thefirst wireless communication device can be released. Continuing theexample from above, the UE 120 a determines, for a first uplink resource(e.g., resource 902 b) of the plurality of periodic uplink resources ofblock 1005, that grant of the first uplink resource for use by the UEcan be released.

Operations 1000 continue, at block 1015, by, based on determining thatgrant of a first uplink resource of the plurality of periodic uplinkresources for use by the first wireless communication device can bereleased, transmitting to the second wireless communication device anindication (e.g., an uplink resource grant release message) that thegrant of the first uplink resource for use by the first wirelesscommunication device can be released. Continuing the example from above,the UE, based on determining that grant of a first uplink resource ofthe plurality of periodic uplink resources for use by the UE can bereleased, transmits to the BS an indication (e.g., an uplink resourcegrant release message in the resource 903 b, shown in FIG. 9) that thegrant of the first uplink resource of block 1010 for use by the UE canbe released.

In certain aspects of operations 1000, the indication of block 1015 istransmitted on a physical uplink control channel.

In certain aspects of operations 1000, determining that the grant of thefirst uplink resource for use by the first wireless communication devicecan be released as in block 1010 comprises determining an uplink databuffer of the first wireless communication device is empty.

In certain aspects of operations 1000, determining that the grant of thefirst uplink resource for use by the first wireless communication devicecan be released as in block 1010 comprises determining an uplink packetis received by the first wireless communication device for processingless than a threshold time prior to occurrence of the first uplinkresource.

In certain aspects of operations 1000, the configuration of block 1005is included in one of a radio resource control (RRC) message or adownlink control information (DCI).

In certain aspects of operations 1000, the operations further include,optionally at block 1020, determining that the first wirelesscommunication device has data to transmit on a second uplink resource.

In certain aspects of operations 1000, the operations further include,optionally at block 1025, based on the determining that the firstwireless communication device has data, refraining from transmitting tothe second wireless communication device a second indication (e.g., anuplink resource grant release message) that grant of the second uplinkresource for use by the first wireless communication device can bereleased. In some such aspects of operations 1000, based on failing toreceive the second indication, the second wireless communication devicetransmits a cancellation indication (CI) to a third wirelesscommunication device indicating to the third wireless communicationdevice to refrain from using the second uplink resource, wherein thethird wireless communication device is allocated the second uplinkresource by the second wireless communication device prior to receivingthe cancellation indication.

In certain first aspects of operations 1000, the operations furtherinclude, optionally at block 1030, based on the determining that thefirst wireless communication device has data, transmitting to the secondwireless communication device a second indication (e.g., an SR) that thefirst wireless communication device has data to transmit on at least thesecond uplink resource.

In certain such first aspects of operations 1000, the first wirelesscommunication device optionally refrains from transmitting to the secondwireless communication device any indication (e.g., uplink resourcegrant release message) of release of any grant of any of the pluralityof periodic uplink resources occurring between transmission of theindication and the determining that the first wireless communicationdevice has data (e.g., as in block 1025), and, optionally at block 1035,the first wireless communication device releases grant of any of theplurality of periodic uplink resources occurring between transmission ofthe indication and the determining that the first wireless communicationdevice has data.

In certain such first aspects of operations 1000, the operations furtherinclude, optionally at block 1040, determining that grant of a thirduplink resource for use by the first wireless communication device canbe released.

In certain such aspects of operations 1000, the operations furtherinclude, optionally at block 1045, based on the determining that thegrant of the third uplink resource for use by the first wirelesscommunication device can be released, transmitting to the secondwireless communication device a third indication (e.g., uplink resourcegrant release message) that the grant of the third uplink resource foruse by the first wireless communication device can be released. In somesuch aspects, the first wireless communication device refrains fromtransmitting to the second wireless communication device anotherindication (e.g., SR) that the first wireless communication device hasdata to transmit for any of the plurality of periodic uplink resourcesoccurring between transmission of the second indication and thedetermining that the grant of the third uplink resource for use by thefirst wireless communication device can be released. In some suchaspects, the first wireless communication device has data to transmit onall of the plurality of periodic uplink resources occurring betweentransmission of the second indication and the determining that the grantof the third uplink resource for use by the first wireless communicationdevice can be released.

In certain such first aspects of operations 1000, resources allocatedfor indicating the first wireless communication device has data totransmit on the uplink are separated in time from resources allocatedfor indicating the first wireless communication device can release grantof resources on the uplink.

In certain such first aspects of operations 1000, resources allocatedfor indicating the first wireless communication device has data totransmit on the uplink are at the same time that resources allocated forindicating the first wireless communication device can release grant ofresources on the uplink, wherein a different coding or frequency is usedto indicate the first wireless communication device has data to transmiton the uplink than is used to indicate the first wireless communicationdevice can release grant of resources on the uplink.

In certain aspects of operations 1000, the second wireless communicationdevice, based on receiving the indication, grants the first uplinkresource to a third wireless communication device for the third wirelesscommunication device to transmit uplink data on the first uplinkresource. In certain such aspects, the second wireless communicationdevice comprises an integrated access and backhaul network (IAB) node,wherein the first wireless communication device comprises a second IABnode or a user equipment (UE), and the third wireless communicationdevice comprises a child IAB node of the second wireless communicationdevice or a second user equipment (UE).

In certain aspects of operations 1000, the second wireless communicationdevice, based on receiving the indication, transmits uplink data on thefirst uplink resource to a third wireless communication device. Incertain such aspects, the second wireless communication device comprisesan integrated access and backhaul network (IAB) node, wherein the firstwireless communication device comprises a second IAB node or a userequipment (UE), and wherein the third wireless communication devicecomprises a parent IAB node of the second wireless communication device.

In certain aspects of operations 1000, the first wireless communicationdevice comprises a user equipment (UE) and the second wirelesscommunication device comprises a base station (BS).

In certain aspects of operations 1000, the second wireless communicationdevice comprises an integrated access and backhaul network (IAB) node.In certain such aspects, the first wireless communication devicecomprises a user equipment (UE) or another IAB node.

FIGS. 11A-11C show a flow diagram illustrating example operations 1100for wireless communication, in accordance with certain aspects of thepresent disclosure. The operations 1100 may be performed, for example,by a first wireless communication device (e.g., such as a BS 110 or IABnode (e.g., DU)). Operations 1100 may be implemented as softwarecomponents that are executed and run on one or more processors (e.g.,controller/processor 240 of FIG. 2). Further, the transmission andreception of signals by the first wireless communication device inoperations 1100 may be enabled, for example, by one or more antennas(e.g., antennas 234 of FIG. 2). In certain aspects, the transmissionand/or reception of signals by the first wireless communication devicemay be implemented via a bus interface of one or more processors (e.g.,controller/processor 240) obtaining and/or outputting signals.

The operations 1100 may begin, at block 1105, by transmitting, to asecond wireless communication device, a configuration (e.g., in aconfigured grant) granting a plurality of periodic uplink resources foruse by the second wireless communication device to transmit data on anuplink to the first wireless communication device. For example, BS 110 a(shown in FIG. 1) transmits to UE 120 a, a configuration (e.g., in aconfigured grant) granting a plurality of periodic uplink resources(e.g., resources 902 a-902 d, shown in FIG. 9) for use by the UE totransmit data on an uplink to the BS.

Operations 1100 continue at block 1110, by receiving, from the secondwireless communication device, a first indication (e.g., an uplinkresource grant release message) that a grant of a first uplink resourceof the plurality of uplink resources for use by the second wirelesscommunication device can be released. Continuing the example from above,the BS receives, from the UE, an indication (e.g., an uplink resourcegrant release message in the uplink resource 903 b or an SR) that agrant of a first uplink resource (e.g., uplink resource 902 b) of theplurality of uplink resources for use by the UE can be released.

Operations 1100 may optionally continue, at block 1115, by, based onreceiving the indication, determining the second wireless communicationdevice has released the first uplink resource. Continuing the examplefrom above, the BS, based on receiving the indication, determines the UEhas released the first uplink resource of block 1110.

In certain aspects of operations 1100, the indication of block 1110 isreceived on a physical uplink control channel.

In certain aspects of operations 1100, the configuration of block 1105is included in one of a radio resource control (RRC) message or adownlink control information (DCI).

In certain aspects of operations 1100, the operations further include,optionally at block 1120, failing to receive a second indication (e.g.,another uplink resource grant release message) that a grant of a seconduplink resource of the plurality of uplink resources of block 1115 foruse by the second wireless communication device can be released. In somesuch aspects, the operations 1100 optionally continue at block 1125 by,based on failing to receive the second indication, transmitting acancellation indication to a third wireless communication deviceindicating to the third wireless communication device to refrain fromusing the second uplink resource, wherein the third wirelesscommunication device is allocated the second uplink resource by thefirst wireless communication device prior to receiving the cancellationindication.

In certain first aspects of operations 1100, the operations furtherinclude, optionally at block 1130, receiving from the second wirelesscommunication device a second indication (e.g., an SR) that the secondwireless communication device has data to transmit on at least a seconduplink resource.

In certain such first aspects of operations 1100, the first wirelesscommunication device fails to receive from the second wirelesscommunication device any indication (e.g., any uplink resource grantrelease message) of release (e.g., as in block 1110) of any grant of anyof the plurality of periodic uplink resources occurring betweenreceiving the indication and receiving the second indication. In somesuch first aspects, the first wireless communication device optionally,at block 1135, determines the second wireless communication devicereleases grant of any of the plurality of periodic uplink resourcesoccurring between receiving the indication and receiving the secondindication.

In certain such first aspects of operations 1100, the operations furtherinclude, optionally at block 1140, receiving, from the second wirelesscommunication device, a third indication (e.g., uplink resource grantrelease message) that a grant of a third uplink resource of theplurality of uplink resources for use by the second wirelesscommunication device can be released. In some such first aspects, thefirst wireless communication device fails to receive from the secondwireless communication device another indication (e.g., an SR) that thefirst wireless communication device has data to transmit for any of theplurality of periodic uplink resources occurring between receiving thesecond indication and receiving the third indication, and the firstwireless communication device determines the second wirelesscommunication device has data to transmit on all of the plurality ofperiodic uplink resources occurring between receiving the secondindication and receiving the third indication.

In certain such first aspects of operations 1100, resources allocatedfor indicating the second wireless communication device has data totransmit on the uplink are separated in time from resources allocatedfor indicating the second wireless communication device can releasegrant of resources on the uplink.

In certain such first aspects of operations 1100, resources allocatedfor indicating the second wireless communication device has data totransmit on the uplink are at the same time that resources allocated forindicating the second wireless communication device can release grant ofresources on the uplink, wherein a different coding or frequency is usedto indicate the second wireless communication device has data totransmit on the uplink than is used to indicate the second wirelesscommunication device can release grant of resources on the uplink.

In certain aspects of operations 1100, the first wireless communicationdevice optionally at block 1145, based on receiving the first indicationof block 1110, grants the first uplink resource to a third wirelesscommunication device for the third wireless communication device totransmit uplink data on the first uplink resource. In certain suchaspects, the first wireless communication device comprises an integratedaccess and backhaul network (IAB) node, wherein the second wirelesscommunication device comprises a second IAB node or a user equipment(UE), and wherein the third wireless communication device comprises achild IAB node of the second wireless communication device or a seconduser equipment (UE).

In certain aspects of operations 1100, the first wireless communicationdevice optionally at block 1150, based on receiving the first indicationin block 1110, transmits uplink data on the first uplink resource to athird wireless communication device. In certain such aspects, the firstwireless communication device comprises an integrated access andbackhaul network (IAB) node, wherein the second wireless communicationdevice comprises a second IAB node or a user equipment (UE), and whereinthe third wireless communication device comprises a parent IAB node ofthe second wireless communication device.

In certain aspects of operations 1100, the second wireless communicationdevice comprises a user equipment (UE) and the first wirelesscommunication device comprises a base station (BS).

In certain aspects of operations 1100, the first wireless communicationdevice comprises an integrated access and backhaul network (IAB) node.In certain such aspects, the second wireless communication devicecomprises a user equipment (UE) or another IAB node.

FIG. 12 illustrates a communications device 1200 that may includevarious components (e.g., corresponding to means-plus-functioncomponents) configured to perform operations for the techniquesdisclosed herein, such as the operations illustrated in FIG. 10. Thecommunications device 1200 includes a processing system 1202 coupled toa transceiver 1208. The transceiver 1208 is configured to transmit andreceive signals for the communications device 1200 via an antenna 1210,such as the various signals as described herein. The processing system1202 may be configured to perform processing functions for thecommunications device 1200, including processing signals received and/orto be transmitted by the communications device 1200.

The processing system 1202 includes a processor 1204 coupled to acomputer-readable medium/memory 1212 via a bus 1206. In certain aspects,the computer-readable medium/memory 1212 is configured to storeinstructions (e.g., computer-executable code) that when executed by theprocessor 1204, cause the processor 1204 to perform the operationsillustrated in FIG. 10, or other operations for performing the varioustechniques discussed herein for managing uplink resources. In certainaspects, computer-readable medium/memory 1212 stores code for receivinga configuration 1213, code for determining release of grant 1214, codefor transmitting indication of release of grant 1215, optional code forrefraining from transmitting indication of release of grant 1216,optional code for transmitting a second indication that thecommunication device has data to transmit 1217, and optional code fortransmitting a third indication that the grant of the third uplinkresource can be released 1218. In certain aspects, the processing system1202 has circuitry configured to implement the code stored in thecomputer-readable medium/memory 1212. The processing system 1202includes circuitry (e.g., an example of means for) for receiving aconfiguration 1220, circuitry (e.g., an example of means for) fordetermining release of grant 1224, circuitry (e.g., an example of meansfor) for transmitting indication of release of grant 1226, optionalcircuitry (e.g., an example of means for) for refraining fromtransmitting indication of release of grant 1227, optional circuitry(e.g., an example of means for) for transmitting a second indicationthat the communication device has data to transmit 1228, and optionalcircuitry (e.g., an example of means for) for transmitting a thirdindication that the grant of the third uplink resource can be released1229. One or more of circuitry 1220, 1224, 1226, 1227, 1228, and 1229may be implemented by one or more of a digital signal processor (DSP), acircuit, an application specific integrated circuit (ASIC), or aprocessor (e.g., a general purpose or specifically programmedprocessor).

FIG. 13 illustrates a communications device 1300 that may includevarious components (e.g., corresponding to means-plus-functioncomponents) configured to perform operations for the techniquesdisclosed herein, such as the operations illustrated in FIG. 11. Thecommunications device 1300 includes a processing system 1302 coupled toa transceiver 1308. The transceiver 1308 is configured to transmit andreceive signals for the communications device 1300 via an antenna 1310,such as the various signals as described herein. The processing system1302 may be configured to perform processing functions for thecommunications device 1300, including processing signals received and/orto be transmitted by the communications device 1300.

The processing system 1302 includes a processor 1304 coupled to acomputer-readable medium/memory 1312 via a bus 1306. In certain aspects,the computer-readable medium/memory 1312 is configured to storeinstructions (e.g., computer-executable code) that when executed by theprocessor 1304, cause the processor 1304 to perform the operationsillustrated in FIG. 11, or other operations for performing the varioustechniques discussed herein for managing uplink resources. In certainaspects, computer-readable medium/memory 1312 stores code fortransmitting a configuration 1313, code for receiving a first indicationof release of grant 1314, and code for determining release of grant1315, code for receiving a second indication that a grant of a seconduplink resource can be released 1316, optional code for transmitting acancellation indication 1317, optional code for receiving a secondindication that the second wireless communication device has data totransmit 1318, and optional code for receiving a third indication that agrant of a third uplink resource can be released 1319. In certainaspects, the processor 1304 has circuitry configured to implement thecode stored in the computer-readable medium/memory 1312. The processor1304 includes circuitry (e.g., an example of means for) for transmittinga configuration 1320, circuitry (e.g., an example of means for) forreceiving a first indication of release of grant 1321, circuitry (e.g.,an example of means for) for determining release of grant 1322,circuitry (e.g., an example of means for) for receiving a secondindication that a grant of a second uplink resource can be released1323, optional circuitry (e.g., an example of means for) fortransmitting a cancellation indication 1324, optional circuitry (e.g.,an example of means for) for receiving a second indication that thesecond wireless communication device has data to transmit 1325, andoptional circuitry (e.g., an example of means for) for receiving a thirdindication that a grant of a third uplink resource can be released 1326.One or more of circuitry 1320, 1321, 1322, 1323, 1324, 1325, and 1326may be implemented by one or more of a digital signal processor (DSP), acircuit, an application specific integrated circuit (ASIC), or aprocessor (e.g., a general purpose or specifically programmedprocessor).

FIG. 14 shows a block diagram 1400 of a device 1405 that supportsmanaging uplink resources in accordance with one or more aspects of thepresent disclosure. The device 1405 may be an example of aspects of a UE120 or a BS 110 as described herein. The device 1405 may include areceiver 1410, an uplink resource manager 1415 (e.g., uplink resourcemanager 112 or 122), and a transmitter 1420. The device 1405 may alsoinclude a processor. Each of these components may be in communicationwith one another (e.g., via one or more buses).

The receiver 1410 may provide a means for receiving information such aspackets, user data, or control information associated with variousinformation channels (e.g., control channels, data channels, andinformation related to power saving of smart repeaters based on atriggering signal, etc.). Information may be passed on to othercomponents of the device 1405. The receiver 1410 may be an example ofaspects of the transceiver 232 or 254 described with reference to FIG.2. The receiver 1410 may utilize a single antenna or a set of antennas.

The uplink resource manager 1415 may support wireless communication inaccordance with examples as disclosed herein.

In certain aspects, the uplink resource manager 1415 may provide meansfor receiving, from a second wireless communication device, aconfiguration granting a plurality of periodic uplink resources for useby the first wireless communication device to transmit data on anuplink; means for based on determining that grant of a first uplinkresource of the plurality of periodic uplink resources for use by thefirst wireless communication device can be released, transmitting to thesecond wireless communication device an indication that the grant of thefirst uplink resource for use by the first wireless communication devicecan be released; means for based on the first wireless communicationdevice having data to transmit on a second uplink resource aftertransmitting the indication, refraining from transmitting to the secondwireless communication device a second indication that grant of thesecond uplink resource for use by the first wireless communicationdevice can be released, wherein, based on failing to receive the secondindication, the second wireless communication device transmits acancellation indication to a third wireless communication deviceindicating to the third wireless communication device to refrain fromusing the second uplink resource, wherein the third wirelesscommunication device is allocated the second uplink resource by thesecond wireless communication device prior to receiving the cancellationindication; means for based on the first wireless communication devicehaving data to transmit on at least a second uplink resource aftertransmitting the indication, transmitting to the second wirelesscommunication device a second indication that the first wirelesscommunication device has data to transmit on at least the second uplinkresource; and/or means for based on determining that grant of a thirduplink resource for use by the first wireless communication device canbe released after transmitting the second indication, transmitting tothe second wireless communication device a third indication that thegrant of the third uplink resource for use by the first wirelesscommunication device can be released, wherein the first wirelesscommunication device refrains from transmitting to the second wirelesscommunication device another indication that the first wirelesscommunication device has data to transmit for any of the plurality ofperiodic uplink resources occurring between transmission of the secondindication and the determining that the grant of the third uplinkresource for use by the first wireless communication device can bereleased, and wherein the first wireless communication device has datato transmit on all of the plurality of periodic uplink resourcesoccurring between transmission of the second indication and thedetermining that the grant of the third uplink resource for use by thefirst wireless communication device can be released.

In certain aspects, the uplink resource manager 1415 may provide meansfor transmitting, to a second wireless communication device, aconfiguration granting a plurality of periodic uplink resources for useby the second wireless communication device to transmit data on anuplink to the first wireless communication device; means for receiving,from the second wireless communication device, a first indication that agrant of a first uplink resource of the plurality of uplink resourcesfor use by the second wireless communication device can be released;means for after receiving the first indication, failing to receive asecond indication that a grant of a second uplink resource of theplurality of uplink resources for use by the second wirelesscommunication device can be released; means for based on failing toreceive the second indication, transmitting a cancellation indication toa third wireless communication device indicating to the third wirelesscommunication device to refrain from using the second uplink resource,wherein the third wireless communication device is allocated the seconduplink resource by the first wireless communication device prior toreceiving the cancellation indication; means for after receiving thefirst indication, receiving from the second wireless communicationdevice a second indication that the second wireless communication devicehas data to transmit on at least a second uplink resource; and/or meansfor after receiving the second indication, receiving, from the secondwireless communication device, a third indication that a grant of athird uplink resource of the plurality of uplink resources for use bythe second wireless communication device can be released, wherein thefirst wireless communication device fails to receive from the secondwireless communication device a fourth indication that the firstwireless communication device has data to transmit for any of theplurality of periodic uplink resources occurring between receiving thesecond indication and receiving the third indication, and wherein thefirst wireless communication device determines the second wirelesscommunication device has data to transmit on all of the plurality ofperiodic uplink resources occurring between receiving the secondindication and receiving the third indication.

The uplink resource manager 1415 may be an example of means forperforming various aspects of managing uplink resources as describedherein. The uplink resource manager 1415, or its sub-components, may beimplemented in hardware (e.g., in uplink resource management circuitry).The circuitry may comprise of processor, digital signal processor (DSP),an application-specific integrated circuit (ASIC), a field programmablegate array (FPGA) or other programmable logic device, discrete gate ortransistor logic, discrete hardware components, or any combinationthereof designed to perform the functions described in the presentdisclosure.

In another implementation, the uplink resource manager 1415, or itssub-components, may be implemented in code (e.g., as uplink resourcemanagement software or firmware) executed by a processor, or anycombination thereof. If implemented in code executed by a processor, thefunctions of the uplink resource manager 1415, or its sub-components maybe executed by a general-purpose processor, a digital signal processor(DSP), an application-specific integrated circuit (ASIC), a fieldprogrammable gate array (FPGA) or other programmable logic device.

In some examples, the uplink resource manager 1415 may be configured toperform various operations (e.g., receiving, determining, transmitting)using or otherwise in cooperation with the receiver 1410, thetransmitter 1420, or both.

The uplink resource manager 1415, or its sub-components, may bephysically located at various positions, including being distributedsuch that portions of functions are implemented at different physicallocations by one or more physical components. In some examples, theuplink resource manager 1415, or its sub-components, may be a separateand distinct component in accordance with various aspects of the presentdisclosure. In some examples, the uplink resource manager 1415, or itssub-components, may be combined with one or more other hardwarecomponents, including but not limited to an input/output (I/O)component, a transceiver, a network server, another computing device,one or more other components described in the present disclosure, or acombination thereof in accordance with various aspects of the presentdisclosure.

The transmitter 1420 may provide means for transmitting signalsgenerated by other components of the device 1405. In some examples, thetransmitter 1420 may be collocated with a receiver 1410 in a transceivermodule. For example, the transmitter 1420 may be an example of thetransceiver 232 or 254 described with reference to FIG. 2. Thetransmitter 1420 may utilize a single antenna or a set of antennas.

Example Aspects

Aspect 1: A method of wireless communication by a first wirelesscommunication device, the method comprising: receiving, from a secondwireless communication device, a configuration granting a plurality ofperiodic uplink resources for use by the first wireless communicationdevice to transmit data on an uplink; determining, for a first uplinkresource of the plurality of periodic uplink resources, that grant ofthe first uplink resource for use by the first wireless communicationdevice can be released; and based on the determining for the firstuplink resource, transmitting to the second wireless communicationdevice an indication that the grant of the first uplink resource for useby the first wireless communication device can be released.

Aspect 2: The method of Aspect 1, wherein the indication is transmittedon a physical uplink control channel (PUCCH).

Aspect 3: The method of one of Aspects 1-2, wherein determining that thegrant of the first uplink resource for use by the first wirelesscommunication device can be released comprises determining an uplinkdata buffer of the first wireless communication device is empty.

Aspect 4: The method of one of Aspects 1-3, wherein determining that thegrant of the first uplink resource for use by the first wirelesscommunication device can be released comprises determining an uplinkpacket is received by the first wireless communication device forprocessing less than a threshold time prior to occurrence of the firstuplink resource.

Aspect 5: The method of one of Aspects 1-4, wherein the configuration isincluded in one of a radio resource control (RRC) message or a downlinkcontrol information (DCI).

Aspect 6: The method of one of Aspects 1-5, further comprising: aftertransmitting the indication, determining that the first wirelesscommunication device has data to transmit on a second uplink resource;and based on the determining that the first wireless communicationdevice has data, refraining from transmitting to the second wirelesscommunication device a second indication that grant of the second uplinkresource for use by the first wireless communication device can bereleased, wherein, based on failing to receive the second indication,the second wireless communication device transmits a cancellationindication to a third wireless communication device indicating to thethird wireless communication device to refrain from using the seconduplink resource, wherein the third wireless communication device isallocated the second uplink resource by the second wirelesscommunication device prior to receiving the cancellation indication.

Aspect 7: The method of one of Aspects 1-5, further comprising: aftertransmitting the indication, determining that the first wirelesscommunication device has data to transmit on at least a second uplinkresource; and based on the determining that the first wirelesscommunication device has data, transmitting to the second wirelesscommunication device a second indication that the first wirelesscommunication device has data to transmit on at least the second uplinkresource.

Aspect 8: The method of Aspect 7, wherein the first wirelesscommunication device refrains from transmitting to the second wirelesscommunication device any indication of release of any grant of any ofthe plurality of periodic uplink resources occurring betweentransmission of the indication and the determining that the firstwireless communication device has data, and wherein the first wirelesscommunication device releases grant of any of the plurality of periodicuplink resources occurring between transmission of the indication andthe determining that the first wireless communication device has data.

Aspect 9: The method of Aspect 7, further comprising: after transmittingthe second indication, determining that grant of a third uplink resourcefor use by the first wireless communication device can be released; andbased on the determining that the grant of the third uplink resource foruse by the first wireless communication device can be released,transmitting to the second wireless communication device a thirdindication that the grant of the third uplink resource for use by thefirst wireless communication device can be released, wherein the firstwireless communication device refrains from transmitting to the secondwireless communication device another indication that the first wirelesscommunication device has data to transmit for any of the plurality ofperiodic uplink resources occurring between transmission of the secondindication and the determining that the grant of the third uplinkresource for use by the first wireless communication device can bereleased, and wherein the first wireless communication device has datato transmit on all of the plurality of periodic uplink resourcesoccurring between transmission of the second indication and thedetermining that the grant of the third uplink resource for use by thefirst wireless communication device can be released.

Aspect 10: The method of Aspect 7, wherein resources allocated forindicating the first wireless communication device has data to transmiton the uplink are separated in time from resources allocated forindicating the first wireless communication device can release grant ofresources on the uplink.

Aspect 11: The method of Aspect 7, wherein resources allocated forindicating the first wireless communication device has data to transmiton the uplink are at the same time that resources allocated forindicating the first wireless communication device can release grant ofresources on the uplink, wherein a different coding or frequency is usedto indicate the first wireless communication device has data to transmiton the uplink than is used to indicate the first wireless communicationdevice can release grant of resources on the uplink.

Aspect 12: The method of one of Aspects 1-11, wherein the secondwireless communication device, based on receiving the indication, grantsthe first uplink resource to a third wireless communication device forthe third wireless communication device to transmit uplink data on thefirst uplink resource.

Aspect 13: The method of Aspect 12, wherein the second wirelesscommunication device comprises an integrated access and backhaul network(IAB) node, wherein the first wireless communication device comprises asecond TAB node or a user equipment (UE), and wherein the third wirelesscommunication device comprises a child TAB node of the second wirelesscommunication device or a second user equipment (UE).

Aspect 14: The method of one of Aspects 1-13, wherein the secondwireless communication device, based on receiving the indication,transmits uplink data on the first uplink resource to a third wirelesscommunication device.

Aspect 15: The method of Aspect 14, wherein the second wirelesscommunication device comprises an integrated access and backhaul network(IAB) node, wherein the first wireless communication device comprises asecond TAB node or a user equipment (UE), and wherein the third wirelesscommunication device comprises a parent TAB node of the second wirelesscommunication device.

Aspect 16: The method of one of Aspects 1-15, wherein the first wirelesscommunication device comprises a user equipment (UE) and the secondwireless communication device comprises a base station (BS).

Aspect 17: The method of one of Aspects 1-16, wherein the secondwireless communication device comprises an integrated access andbackhaul network (IAB) node.

Aspect 18: The method of Aspect 17, wherein the first wirelesscommunication device comprises a user equipment (UE).

Aspect 19: The method of Aspect 17, wherein the first wirelesscommunication device comprises another TAB node.

Aspect 20: A method of wireless communication by a first wirelesscommunication device, the method comprising: transmitting, to a secondwireless communication device, a configuration granting a plurality ofperiodic uplink resources for use by the second wireless communicationdevice to transmit data on an uplink to the first wireless communicationdevice; receiving, from the second wireless communication device, afirst indication that a grant of a first uplink resource of theplurality of uplink resources for use by the second wirelesscommunication device can be released; and based on the receiving theindication, determining the second wireless communication device hasreleased the first uplink resource.

Aspect 21: The method of Aspect 20, wherein the first indication isreceived on a physical uplink control channel (PUCCH).

Aspect 22: The method of one of Aspects 20-21, wherein the configurationis included in one of a radio resource control (RRC) message or adownlink control information (DCI).

Aspect 23: The method of one of Aspects 20-22, further comprising: afterreceiving the first indication, failing to receive a second indicationthat a grant of a second uplink resource of the plurality of uplinkresources for use by the second wireless communication device can bereleased; and based on failing to receive the second indication,transmitting a cancellation indication to a third wireless communicationdevice indicating to the third wireless communication device to refrainfrom using the second uplink resource, wherein the third wirelesscommunication device is allocated the second uplink resource by thefirst wireless communication device prior to receiving the cancellationindication.

Aspect 24: The method of one of Aspects 20-23, further comprising: afterreceiving the first indication, receiving from the second wirelesscommunication device a second indication that the second wirelesscommunication device has data to transmit on at least a second uplinkresource.

Aspect 25: The method of Aspect 24, wherein the first wirelesscommunication device fails to receive from the second wirelesscommunication device any indication of release of any grant of any ofthe plurality of periodic uplink resources occurring between receivingthe first indication and receiving the second indication, and whereinthe first wireless communication device determines the second wirelesscommunication device releases grant of any of the plurality of periodicuplink resources occurring between receiving the first indication andreceiving the second indication.

Aspect 26: The method of Aspect 24, further comprising: after receivingthe second indication, receiving, from the second wireless communicationdevice, a third indication that a grant of a third uplink resource ofthe plurality of uplink resources for use by the second wirelesscommunication device can be released, wherein the first wirelesscommunication device fails to receive from the second wirelesscommunication device a fourth indication that the first wirelesscommunication device has data to transmit for any of the plurality ofperiodic uplink resources occurring between receiving the secondindication and receiving the third indication, and wherein the firstwireless communication device determines the second wirelesscommunication device has data to transmit on all of the plurality ofperiodic uplink resources occurring between receiving the secondindication and receiving the third indication.

Aspect 27: The method of Aspect 24, wherein resources allocated forindicating the second wireless communication device has data to transmiton the uplink are separated in time from resources allocated forindicating the second wireless communication device can release grant ofresources on the uplink.

Aspect 28: The method of Aspect 24, wherein resources allocated forindicating the second wireless communication device has data to transmiton the uplink are at the same time that resources allocated forindicating the second wireless communication device can release grant ofresources on the uplink, wherein a different coding or frequency is usedto indicate the second wireless communication device has data totransmit on the uplink than is used to indicate the second wirelesscommunication device can release grant of resources on the uplink.

Aspect 29: The method of one of Aspects 20-28, wherein the firstwireless communication device, based on receiving the indication, grantsthe first uplink resource to a third wireless communication device forthe third wireless communication device to transmit uplink data on thefirst uplink resource.

Aspect 30: The method of Aspect 29, wherein the first wirelesscommunication device comprises an integrated access and backhaul network(IAB) node, wherein the second wireless communication device comprises asecond TAB node or a user equipment (UE), and wherein the third wirelesscommunication device comprises a child TAB node of the second wirelesscommunication device or a second user equipment (UE).

Aspect 31: The method of one of Aspects 20-30, wherein the firstwireless communication device, based on receiving the indication,transmits uplink data on the first uplink resource to a third wirelesscommunication device.

Aspect 32: The method of Aspect 31, wherein the first wirelesscommunication device comprises an integrated access and backhaul network(IAB) node, wherein the second wireless communication device comprises asecond IAB node or a user equipment (UE), and wherein the third wirelesscommunication device comprises a parent IAB node of the second wirelesscommunication device.

Aspect 33: The method of one of Aspects 20-32, wherein the secondwireless communication device comprises a user equipment (UE) and thefirst wireless communication device comprises a base station (BS).

Aspect 34: The method of one of Aspects 20-33, wherein the firstwireless communication device comprises an integrated access andbackhaul network (IAB) node.

Aspect 35: The method of Aspect 34, wherein the second wirelesscommunication device comprises a user equipment (UE).

Aspect 36: The method of Aspect 34, wherein the second wirelesscommunication device comprises another IAB node.

Aspect 37: A first wireless communication device comprising: a memory;and a processor coupled to the memory, the processor and memory beingconfigured to perform the method of any one of Aspects 1-36.

Aspect 38: A first wireless communication device comprising: one or moremeans for performing the method of any one of Aspects 1-36.

Aspect 39: A non-transitory computer-readable storage medium forwireless communication by a first wireless communication device, themedium having instructions stored thereon for performing the method ofany one of Aspects 1-36.

Aspect 40: A first wireless communication device comprising: a memory;and a processor coupled to the memory, the processor and memory beingconfigured to: transmit, to a second wireless communication device, aconfiguration granting a plurality of periodic uplink resources for useby the second wireless communication device to transmit data on anuplink to the first wireless communication device; receive, from thesecond wireless communication device, a first indication that a grant ofa first uplink resource of the plurality of uplink resources for use bythe second wireless communication device can be released; and based onthe receiving the indication, determine the second wirelesscommunication device has released the first uplink resource.

Aspect 41: A first wireless communication device comprising: a memory;and a processor coupled to the memory, the processor and memory beingconfigured to: receive, from a second wireless communication device, aconfiguration granting a plurality of periodic uplink resources for useby the first wireless communication device to transmit data on anuplink; determine, for a first uplink resource of the plurality ofperiodic uplink resources, that grant of the first uplink resource foruse by the first wireless communication device can be released; andbased on the determining for the first uplink resource, transmit to thesecond wireless communication device an indication that the grant of thefirst uplink resource for use by the first wireless communication devicecan be released.

Additional Considerations

The techniques described herein may be used for various wirelesscommunication technologies, such as 3GPP Long Term Evolution (LTE),LTE-Advanced (LTE-A), code division multiple access (CDMA), timedivision multiple access (TDMA), frequency division multiple access(FDMA), orthogonal frequency division multiple access (OFDMA),single-carrier frequency division multiple access (SC-FDMA), timedivision synchronous code division multiple access (TD-SCDMA), and othernetworks. The terms “network” and “system” are often usedinterchangeably.

A CDMA network may implement a radio technology such as UniversalTerrestrial Radio Access (UTRA), cdma2000, etc. UTRA includes WidebandCDMA (WCDMA) and other variants of CDMA. cdma2000 covers IS-2000, IS-95and IS-856 standards. A TDMA network may implement a radio technologysuch as Global System for Mobile Communications (GSM). An OFDMA networkmay implement a radio technology such as NR (e.g. 5G RA), Evolved UTRA(E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16(WiMAX), IEEE 802.20, Flash-OFDMA, etc. UTRA and E-UTRA are part ofUniversal Mobile Telecommunication System (UMTS). LTE and LTE-A arereleases of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A and GSMare described in documents from an organization named “3rd GenerationPartnership Project” (3GPP). cdma2000 and UMB are described in documentsfrom an organization named “3rd Generation Partnership Project 2”(3GPP2).

The techniques described herein may be used for the wireless networksand radio technologies mentioned above as well as other wirelessnetworks and radio technologies. For clarity, while aspects may bedescribed herein using terminology commonly associated with 3G, 4G,and/or 5G wireless technologies, aspects of the present disclosure canbe applied in other generation-based communication systems.

New Radio (NR) is an emerging wireless communications technology underdevelopment in conjunction with the 5G Technology Forum (SGTF). NRaccess (e.g., 5G NR) may support various wireless communicationservices, such as enhanced mobile broadband (eMBB) targeting widebandwidth (e.g., 80 MHz or beyond), millimeter wave (mmW) targeting highcarrier frequency (e.g., 25 GHz or beyond), massive machine typecommunications MTC (mMTC) targeting non-backward compatible MTCtechniques, and/or mission critical targeting ultra-reliable low-latencycommunications (URLLC). These services may include latency andreliability requirements. These services may also have differenttransmission time intervals (TTI) to meet respective quality of service(QoS) requirements. In addition, these services may co-exist in the samesubframe.

In 3GPP, the term “cell” can refer to a coverage area of a Node B (NB)and/or a NB subsystem serving this coverage area, depending on thecontext in which the term is used. In NR systems, the term “cell” andBS, next generation NodeB (gNB or gNodeB), access point (AP),distributed unit (DU), carrier, or transmission reception point (TRP)may be used interchangeably. A BS may provide communication coverage fora macro cell, a pico cell, a femto cell, and/or other types of cells. Amacro cell may cover a relatively large geographic area (e.g., severalkilometers in radius) and may allow unrestricted access by UEs withservice subscription. A pico cell may cover a relatively smallgeographic area and may allow unrestricted access by UEs with servicesubscription. A femto cell may cover a relatively small geographic area(e.g., a home) and may allow restricted access by UEs having anassociation with the femto cell (e.g., UEs in a Closed Subscriber Group(CSG), UEs for users in the home, etc.). A BS for a macro cell may bereferred to as a macro BS. A BS for a pico cell may be referred to as apico BS. ABS for a femto cell may be referred to as a femto BS or a homeBS.

A UE may also be referred to as a mobile station, a terminal, an accessterminal, a subscriber unit, a station, a Customer Premises Equipment(CPE), a cellular phone, a smart phone, a personal digital assistant(PDA), a wireless modem, a wireless communication device, a handhelddevice, a laptop computer, a cordless phone, a wireless local loop (WLL)station, a tablet computer, a camera, a gaming device, a netbook, asmartbook, an ultrabook, an appliance, a medical device or medicalequipment, a biometric sensor/device, a wearable device such as a smartwatch, smart clothing, smart glasses, a smart wrist band, smart jewelry(e.g., a smart ring, a smart bracelet, etc.), an entertainment device(e.g., a music device, a video device, a satellite radio, etc.), avehicular component or sensor, a smart meter/sensor, industrialmanufacturing equipment, a global positioning system device, or anyother suitable device that is configured to communicate via a wirelessor wired medium. Some UEs may be considered machine-type communication(MTC) devices or evolved MTC (eMTC) devices. MTC and eMTC UEs include,for example, robots, drones, remote devices, sensors, meters, monitors,location tags, etc., that may communicate with a BS, another device(e.g., remote device), or some other entity. A wireless node mayprovide, for example, connectivity for or to a network (e.g., a widearea network such as Internet or a cellular network) via a wired orwireless communication link. Some UEs may be consideredInternet-of-Things (IoT) devices, which may be narrowband IoT (NB-IoT)devices.

Certain wireless networks (e.g., LTE) utilize orthogonal frequencydivision multiplexing (OFDM) on the downlink and single-carrierfrequency division multiplexing (SC-FDM) on the uplink. OFDM and SC-FDMpartition the system bandwidth into multiple (K) orthogonal subcarriers,which are also commonly referred to as tones, bins, etc. Each subcarriermay be modulated with data. In general, modulation symbols are sent inthe frequency domain with OFDM and in the time domain with SC-FDM. Thespacing between adjacent subcarriers may be fixed, and the total numberof subcarriers (K) may be dependent on the system bandwidth. Forexample, the spacing of the subcarriers may be 15 kHz and the minimumresource allocation (called a “resource block” (RB)) may be 12subcarriers (or 180 kHz). Consequently, the nominal Fast FourierTransfer (FFT) size may be equal to 128, 256, 512, 1024 or 2048 forsystem bandwidth of 1.25, 2.5, 5, 10, or 20 megahertz (MHz),respectively. The system bandwidth may also be partitioned intosubbands. For example, a subband may cover 1.8 MHz (e.g., 6 RBs), andthere may be 1, 2, 4, 8, or 16 subbands for system bandwidth of 1.25,2.5, 5, 10 or 20 MHz, respectively. In LTE, the basic transmission timeinterval (TTI) or packet duration is the 1 ms subframe.

NR may utilize OFDM with a CP on the uplink and downlink and includesupport for half-duplex operation using TDD. In NR, a subframe is still1 ms, but the basic TTI is referred to as a slot. A subframe contains avariable number of slots (e.g., 1, 2, 4, 8, 16, . . . slots) dependingon the subcarrier spacing. The NR RB is 12 consecutive frequencysubcarriers. NR may support a base subcarrier spacing of 15 KHz andother subcarrier spacing may be defined with respect to the basesubcarrier spacing, for example, 30 kHz, 60 kHz, 120 kHz, 240 kHz, etc.The symbol and slot lengths scale with the subcarrier spacing. The CPlength also depends on the subcarrier spacing. Beamforming may besupported and beam direction may be dynamically configured. MIMOtransmissions with precoding may also be supported. In some examples,MIMO configurations in the DL may support up to 8 transmit antennas withmulti-layer DL transmissions up to 8 streams and up to 2 streams per UE.In some examples, multi-layer transmissions with up to 2 streams per UEmay be supported. Aggregation of multiple cells may be supported with upto 8 serving cells.

In some examples, access to the air interface may be scheduled. Ascheduling entity (e.g., a BS) allocates resources for communicationamong some or all devices and equipment within its service area or cell.The scheduling entity may be responsible for scheduling, assigning,reconfiguring, and releasing resources for one or more subordinateentities. That is, for scheduled communication, subordinate entitiesutilize resources allocated by the scheduling entity. Base stations arenot the only entities that may function as a scheduling entity. In someexamples, a UE may function as a scheduling entity and may scheduleresources for one or more subordinate entities (e.g., one or more otherUEs), and the other UEs may utilize the resources scheduled by the UEfor wireless communication. In some examples, a UE may function as ascheduling entity in a peer-to-peer (P2P) network, and/or in a meshnetwork. In a mesh network example, UEs may communicate directly withone another in addition to communicating with a scheduling entity.

In some examples, two or more subordinate entities (e.g., UEs) maycommunicate with each other using sidelink signals. Real-worldapplications of such sidelink communications may include public safety,proximity services, UE-to-network relaying, vehicle-to-vehicle (V2V)communications, Internet of Everything (IoE) communications, IoTcommunications, mission-critical mesh, and/or various other suitableapplications. Generally, a sidelink signal may refer to a signalcommunicated from one subordinate entity (e.g., UE1) to anothersubordinate entity (e.g., UE2) without relaying that communicationthrough the scheduling entity (e.g., UE or BS), even though thescheduling entity may be utilized for scheduling and/or controlpurposes. In some examples, the sidelink signals may be communicatedusing a licensed spectrum (unlike wireless local area networks, whichtypically use an unlicensed spectrum).

The methods disclosed herein comprise one or more steps or actions forachieving the methods. The method steps and/or actions may beinterchanged with one another without departing from the scope of theclaims. In other words, unless a specific order of steps or actions isspecified, the order and/or use of specific steps and/or actions may bemodified without departing from the scope of the claims.

As used herein, a phrase referring to “at least one of” a list of itemsrefers to any combination of those items, including single members. Asan example, “at least one of: a, b, or c” is intended to cover a, b, c,a-b, a-c, b-c, and a-b-c, as well as any combination with multiples ofthe same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b,b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c).

As used herein, the term “determining” encompasses a wide variety ofactions. For example, “determining” may include calculating, computing,processing, deriving, investigating, looking up (e.g., looking up in atable, a database or another data structure), ascertaining and the like.Also, “determining” may include receiving (e.g., receiving information),accessing (e.g., accessing data in a memory) and the like. Also,“determining” may include resolving, selecting, choosing, establishingand the like.

The previous description is provided to enable any person skilled in theart to practice the various aspects described herein. Variousmodifications to these aspects will be readily apparent to those skilledin the art, and the generic principles defined herein may be applied toother aspects. Thus, the claims are not intended to be limited to theaspects shown herein, but is to be accorded the full scope consistentwith the language of the claims, wherein reference to an element in thesingular is not intended to mean “one and only one” unless specificallyso stated, but rather “one or more.” Unless specifically statedotherwise, the term “some” refers to one or more. All structural andfunctional equivalents to the elements of the various aspects describedthroughout this disclosure that are known or later come to be known tothose of ordinary skill in the art are expressly incorporated herein byreference and are intended to be encompassed by the claims. Moreover,nothing disclosed herein is intended to be dedicated to the publicregardless of whether such disclosure is explicitly recited in theclaims. No claim element is to be construed under the provisions of 35U.S.C. § 112(f) unless the element is expressly recited using the phrase“means for” or, in the case of a method claim, the element is recitedusing the phrase “step for.”

The various operations of methods described above may be performed byany suitable means capable of performing the corresponding functions.The means may include various hardware and/or software component(s)and/or module(s), including, but not limited to a circuit, anapplication specific integrated circuit (ASIC), or processor. Generally,where there are operations illustrated in figures, those operations mayhave corresponding counterpart means-plus-function components withsimilar numbering.

The various illustrative logical blocks, modules and circuits describedin connection with the present disclosure may be implemented orperformed with a general purpose processor, a digital signal processor(DSP), an application specific integrated circuit (ASIC), a fieldprogrammable gate array (FPGA) or other programmable logic device (PLD),discrete gate or transistor logic, discrete hardware components, or anycombination thereof designed to perform the functions described herein.

A general-purpose processor may be a microprocessor, but in thealternative, the processor may be any commercially available processor,controller, microcontroller, or state machine. A processor may also beimplemented as a combination of computing devices, e.g., a combinationof a DSP and a microprocessor, a plurality of microprocessors, one ormore microprocessors in conjunction with a DSP core, or any other suchconfiguration.

If implemented in hardware, an example hardware configuration maycomprise a processing system in a wireless node. The processing systemmay be implemented with a bus architecture. The bus may include anynumber of interconnecting buses and bridges depending on the specificapplication of the processing system and the overall design constraints.The bus may link together various circuits including a processor,machine-readable media, and a bus interface. The bus interface may beused to connect a network adapter, among other things, to the processingsystem via the bus. The network adapter may be used to implement thesignal processing functions of the PHY layer. In the case of a userterminal 120 (see FIG. 1), a user interface (e.g., keypad, display,mouse, joystick, etc.) may also be connected to the bus. The bus mayalso link various other circuits such as timing sources, peripherals,voltage regulators, power management circuits, and the like, which arewell known in the art, and therefore, will not be described any further.The processor may be implemented with one or more general-purpose and/orspecial-purpose processors. Examples include microprocessors,microcontrollers, DSP processors, and other circuitry that can executesoftware. Those skilled in the art will recognize how best to implementthe described functionality for the processing system depending on theparticular application and the overall design constraints imposed on theoverall system.

If implemented in software, the functions may be stored or transmittedover as one or more instructions or code on a computer readable medium.Software shall be construed broadly to mean instructions, data, or anycombination thereof, whether referred to as software, firmware,middleware, microcode, hardware description language, or otherwise.Computer-readable media include both computer storage media andcommunication media including any medium that facilitates transfer of acomputer program from one place to another. The processor may beresponsible for managing the bus and general processing, including theexecution of software modules stored on the machine-readable storagemedia. A computer-readable storage medium may be coupled to a processorsuch that the processor can read information from, and write informationto, the storage medium. In the alternative, the storage medium may beintegral to the processor. By way of example, the machine-readable mediamay include a transmission line, a carrier wave modulated by data,and/or a computer readable storage medium with instructions storedthereon separate from the wireless node, all of which may be accessed bythe processor through the bus interface. Alternatively, or in addition,the machine-readable media, or any portion thereof, may be integratedinto the processor, such as the case may be with cache and/or generalregister files. Examples of machine-readable storage media may include,by way of example, RAM (Random Access Memory), flash memory, ROM (ReadOnly Memory), PROM (Programmable Read-Only Memory), EPROM (ErasableProgrammable Read-Only Memory), EEPROM (Electrically ErasableProgrammable Read-Only Memory), registers, magnetic disks, opticaldisks, hard drives, or any other suitable storage medium, or anycombination thereof. The machine-readable media may be embodied in acomputer-program product.

A software module may comprise a single instruction, or manyinstructions, and may be distributed over several different codesegments, among different programs, and across multiple storage media.The computer-readable media may comprise a number of software modules.The software modules include instructions that, when executed by anapparatus such as a processor, cause the processing system to performvarious functions. The software modules may include a transmissionmodule and a receiving module. Each software module may reside in asingle storage device or be distributed across multiple storage devices.By way of example, a software module may be loaded into RAM from a harddrive when a triggering event occurs. During execution of the softwaremodule, the processor may load some of the instructions into cache toincrease access speed. One or more cache lines may then be loaded into ageneral register file for execution by the processor. When referring tothe functionality of a software module below, it will be understood thatsuch functionality is implemented by the processor when executinginstructions from that software module.

Also, any connection is properly termed a computer-readable medium. Forexample, if the software is transmitted from a website, server, or otherremote source using a coaxial cable, fiber optic cable, twisted pair,digital subscriber line (DSL), or wireless technologies such as infrared(IR), radio, and microwave, then the coaxial cable, fiber optic cable,twisted pair, DSL, or wireless technologies such as infrared, radio, andmicrowave are included in the definition of medium. Disk and disc, asused herein, include compact disc (CD), laser disc, optical disc,digital versatile disc (DVD), floppy disk, and Blu-ray® disc where disksusually reproduce data magnetically, while discs reproduce dataoptically with lasers. Thus, in some aspects computer-readable media maycomprise non-transitory computer-readable media (e.g., tangible media).In addition, for other aspects computer-readable media may comprisetransitory computer-readable media (e.g., a signal). Combinations of theabove should also be included within the scope of computer-readablemedia.

Thus, certain aspects may comprise a computer program product forperforming the operations presented herein. For example, such a computerprogram product may comprise a computer-readable medium havinginstructions stored (and/or encoded) thereon, the instructions beingexecutable by one or more processors to perform the operations describedherein. For example, instructions for performing the operationsdescribed herein and illustrated in FIGS. 10-11.

Further, it should be appreciated that modules and/or other appropriatemeans for performing the methods and techniques described herein can bedownloaded and/or otherwise obtained by a user terminal and/or basestation as applicable. For example, such a device can be coupled to aserver to facilitate the transfer of means for performing the methodsdescribed herein. Alternatively, various methods described herein can beprovided via storage means (e.g., RAM, ROM, a physical storage mediumsuch as a compact disc (CD) or floppy disk, etc.), such that a userterminal and/or base station can obtain the various methods uponcoupling or providing the storage means to the device. Moreover, anyother suitable technique for providing the methods and techniquesdescribed herein to a device can be utilized.

It is to be understood that the claims are not limited to the preciseconfiguration and components illustrated above. Various modifications,changes and variations may be made in the arrangement, operation anddetails of the methods and apparatus described above without departingfrom the scope of the claims.

What is claimed is:
 1. A method of wireless communication by a firstwireless communication device, the method comprising: receiving, from asecond wireless communication device, a configuration granting aplurality of periodic uplink resources for use by the first wirelesscommunication device to transmit data on an uplink; and based ondetermining that grant of a first uplink resource of the plurality ofperiodic uplink resources for use by the first wireless communicationdevice can be released, transmitting to the second wirelesscommunication device an indication that the grant of the first uplinkresource for use by the first wireless communication device can bereleased.
 2. The method of claim 1, wherein the indication istransmitted on a physical uplink control channel (PUCCH).
 3. The methodof claim 1, wherein the grant of the first uplink resource for use bythe first wireless communication device can be released based on anuplink data buffer of the first wireless communication device beingempty.
 4. The method of claim 1, wherein the grant of the first uplinkresource for use by the first wireless communication device can bereleased based on an uplink packet being received by the first wirelesscommunication device for processing less than a threshold time prior tooccurrence of the first uplink resource.
 5. The method of claim 1,wherein the configuration is included in one of a radio resource control(RRC) message or a downlink control information (DCI).
 6. The method ofclaim 1, further comprising: based on the first wireless communicationdevice having data to transmit on a second uplink resource aftertransmitting the indication, refraining from transmitting to the secondwireless communication device a second indication that grant of thesecond uplink resource for use by the first wireless communicationdevice can be released, wherein, based on failing to receive the secondindication, the second wireless communication device transmits acancellation indication to a third wireless communication deviceindicating to the third wireless communication device to refrain fromusing the second uplink resource, wherein the third wirelesscommunication device is allocated the second uplink resource by thesecond wireless communication device prior to receiving the cancellationindication.
 7. The method of claim 1, further comprising: based on thefirst wireless communication device having data to transmit on at leasta second uplink resource after transmitting the indication, transmittingto the second wireless communication device a second indication that thefirst wireless communication device has data to transmit on at least thesecond uplink resource.
 8. The method of claim 7, wherein the firstwireless communication device refrains from transmitting to the secondwireless communication device any indication of release of any grant ofany of the plurality of periodic uplink resources occurring betweentransmission of the indication and determining that the first wirelesscommunication device has data, and wherein the first wirelesscommunication device releases grant of any of the plurality of periodicuplink resources occurring between transmission of the indication andthe determining that the first wireless communication device has data.9. The method of claim 7, further comprising: based on determining thatgrant of a third uplink resource for use by the first wirelesscommunication device can be released after transmitting the secondindication, transmitting to the second wireless communication device athird indication that the grant of the third uplink resource for use bythe first wireless communication device can be released, wherein thefirst wireless communication device refrains from transmitting to thesecond wireless communication device another indication that the firstwireless communication device has data to transmit for any of theplurality of periodic uplink resources occurring between transmission ofthe second indication and the determining that the grant of the thirduplink resource for use by the first wireless communication device canbe released, and wherein the first wireless communication device hasdata to transmit on all of the plurality of periodic uplink resourcesoccurring between transmission of the second indication and thedetermining that the grant of the third uplink resource for use by thefirst wireless communication device can be released.
 10. The method ofclaim 7, wherein resources allocated for indicating the first wirelesscommunication device has data to transmit on the uplink are separated intime from resources allocated for indicating the first wirelesscommunication device can release grant of resources on the uplink. 11.The method of claim 7, wherein resources allocated for indicating thefirst wireless communication device has data to transmit on the uplinkare at the same time that resources allocated for indicating the firstwireless communication device can release grant of resources on theuplink, wherein a different coding or frequency is used to indicate thefirst wireless communication device has data to transmit on the uplinkthan is used to indicate the first wireless communication device canrelease grant of resources on the uplink.
 12. The method of claim 1,wherein the second wireless communication device, based on receiving theindication, transmits uplink data on the first uplink resource to athird wireless communication device.
 13. The method of claim 1, whereinthe first wireless communication device comprises a user equipment (UE)and the second wireless communication device comprises a base station(BS).
 14. The method of claim 1, wherein the second wirelesscommunication device comprises an integrated access and backhaul network(IAB) node and wherein the first wireless device comprises at least oneof a user equipment (UE) or another TAB node.
 15. A method of wirelesscommunication by a first wireless communication device, the methodcomprising: transmitting, to a second wireless communication device, aconfiguration granting a plurality of periodic uplink resources for useby the second wireless communication device to transmit data on anuplink to the first wireless communication device; and receiving, fromthe second wireless communication device, a first indication that agrant of a first uplink resource of the plurality of uplink resourcesfor use by the second wireless communication device can be released. 16.The method of claim 15, wherein the first indication is received on aphysical uplink control channel (PUCCH).
 17. The method of claim 15,wherein the configuration is included in one of a radio resource control(RRC) message or a downlink control information (DCI).
 18. The method ofclaim 15, further comprising: after receiving the first indication,failing to receive a second indication that a grant of a second uplinkresource of the plurality of uplink resources for use by the secondwireless communication device can be released; and based on failing toreceive the second indication, transmitting a cancellation indication toa third wireless communication device indicating to the third wirelesscommunication device to refrain from using the second uplink resource,wherein the third wireless communication device is allocated the seconduplink resource by the first wireless communication device prior toreceiving the cancellation indication.
 19. The method of claim 15,further comprising: after receiving the first indication, receiving fromthe second wireless communication device a second indication that thesecond wireless communication device has data to transmit on at least asecond uplink resource.
 20. The method of claim 19, wherein the firstwireless communication device fails to receive from the second wirelesscommunication device any indication of release of any grant of any ofthe plurality of periodic uplink resources occurring between receivingthe first indication and receiving the second indication, and whereinthe first wireless communication device determines the second wirelesscommunication device releases grant of any of the plurality of periodicuplink resources occurring between receiving the first indication andreceiving the second indication.
 21. The method of claim 19, furthercomprising: after receiving the second indication, receiving, from thesecond wireless communication device, a third indication that a grant ofa third uplink resource of the plurality of uplink resources for use bythe second wireless communication device can be released, wherein thefirst wireless communication device fails to receive from the secondwireless communication device a fourth indication that the firstwireless communication device has data to transmit for any of theplurality of periodic uplink resources occurring between receiving thesecond indication and receiving the third indication, and wherein thefirst wireless communication device determines the second wirelesscommunication device has data to transmit on all of the plurality ofperiodic uplink resources occurring between receiving the secondindication and receiving the third indication.
 22. The method of claim19, wherein resources allocated for indicating the second wirelesscommunication device has data to transmit on the uplink are separated intime from resources allocated for indicating the second wirelesscommunication device can release grant of resources on the uplink. 23.The method of claim 19, wherein resources allocated for indicating thesecond wireless communication device has data to transmit on the uplinkare at the same time that resources allocated for indicating the secondwireless communication device can release grant of resources on theuplink, wherein a different coding or frequency is used to indicate thesecond wireless communication device has data to transmit on the uplinkthan is used to indicate the second wireless communication device canrelease grant of resources on the uplink.
 24. The method of claim 15,wherein the first wireless communication device, based on receiving theindication, grants the first uplink resource to a third wirelesscommunication device for the third wireless communication device totransmit uplink data on the first uplink resource.
 25. The method ofclaim 24, wherein the first wireless communication device comprises anintegrated access and backhaul network (IAB) node, wherein the secondwireless communication device comprises a second IAB node or a userequipment (UE), and wherein the third wireless communication devicecomprises a child IAB node of the second wireless communication deviceor a second user equipment (UE).
 26. The method of claim 15, wherein thefirst wireless communication device, based on receiving the indication,transmits uplink data on the first uplink resource to a third wirelesscommunication device.
 27. The method of claim 15, wherein the secondwireless communication device comprises a user equipment (UE) and thefirst wireless communication device comprises a base station (BS). 28.The method of claim 15, wherein the first wireless communication devicecomprises an integrated access and backhaul network (IAB) node andwherein the second wireless communication device comprises at least oneof a user equipment (UE) or another IAB node.
 29. A first wirelesscommunication device comprising: a memory; and a processor coupled tothe memory, the processor and memory being configured to: receive, froma second wireless communication device, a configuration granting aplurality of periodic uplink resources for use by the first wirelesscommunication device to transmit data on an uplink; determine, for afirst uplink resource of the plurality of periodic uplink resources,that grant of the first uplink resource for use by the first wirelesscommunication device can be released; and based on the determining forthe first uplink resource, transmit to the second wireless communicationdevice an indication that the grant of the first uplink resource for useby the first wireless communication device can be released.
 30. A firstwireless communication device comprising: a memory; and a processorcoupled to the memory, the processor and memory being configured to:transmit, to a second wireless communication device, a configurationgranting a plurality of periodic uplink resources for use by the secondwireless communication device to transmit data on an uplink to the firstwireless communication device; receive, from the second wirelesscommunication device, a first indication that a grant of a first uplinkresource of the plurality of uplink resources for use by the secondwireless communication device can be released; and based on thereceiving the indication, determine the second wireless communicationdevice has released the first uplink resource.